Is there an easy way in C# to read a properties file that has each property on a separate line followed by an equals sign and the value, such as the following:
ServerName=prod-srv1
Port=8888
CustomProperty=Any value
In Java, the Properties class handles this parsing easily:
Properties myProperties=new Properties();
FileInputStream fis = new FileInputStream (new File("CustomProps.properties"));
myProperties.load(fis);
System.out.println(myProperties.getProperty("ServerName"));
System.out.println(myProperties.getProperty("CustomProperty"));
I can easily load the file in C# and parse each line, but is there a built in way to easily get a property without having to parse out the key name and equals sign myself? The C# information I have found seems to always favor XML, but this is an existing file that I don't control and I would prefer to keep it in the existing format as it will require more time to get another team to change it to XML than parsing the existing file.
This question is related to
c#
configuration
file-io
load
Yeah there's no built in classes to do this that I'm aware of.
But that shouldn't really be an issue should it? It looks easy enough to parse just by storing the result of Stream.ReadToEnd() in a string, splitting based on new lines and then splitting each record on the = character. What you'd be left with is a bunch of key value pairs which you can easily toss into a dictionary.
Here's an example that might work for you:
public static Dictionary<string, string> GetProperties(string path)
{
string fileData = "";
using (StreamReader sr = new StreamReader(path))
{
fileData = sr.ReadToEnd().Replace("\r", "");
}
Dictionary<string, string> Properties = new Dictionary<string, string>();
string[] kvp;
string[] records = fileData.Split("\n".ToCharArray());
foreach (string record in records)
{
kvp = record.Split("=".ToCharArray());
Properties.Add(kvp[0], kvp[1]);
}
return Properties;
}
Here's an example of how to use it:
Dictionary<string,string> Properties = GetProperties("data.txt");
Console.WriteLine("Hello: " + Properties["Hello"]);
Console.ReadKey();
C# generally uses xml-based config files rather than the *.ini-style file like you said, so there's nothing built-in to handle this. However, google returns a number of promising results.
I've written a method that allows emty lines, outcommenting and quoting within the file.
Examples:
var1="value1"
var2='value2'
'var3=outcommented
;var4=outcommented, too
Here's the method:
public static IDictionary ReadDictionaryFile(string fileName)
{
Dictionary<string, string> dictionary = new Dictionary<string, string>();
foreach (string line in File.ReadAllLines(fileName))
{
if ((!string.IsNullOrEmpty(line)) &&
(!line.StartsWith(";")) &&
(!line.StartsWith("#")) &&
(!line.StartsWith("'")) &&
(line.Contains('=')))
{
int index = line.IndexOf('=');
string key = line.Substring(0, index).Trim();
string value = line.Substring(index + 1).Trim();
if ((value.StartsWith("\"") && value.EndsWith("\"")) ||
(value.StartsWith("'") && value.EndsWith("'")))
{
value = value.Substring(1, value.Length - 2);
}
dictionary.Add(key, value);
}
}
return dictionary;
}
No there is not : But I have created one easy class to help :
public class PropertiesUtility
{
private static Hashtable ht = new Hashtable();
public void loadProperties(string path)
{
string[] lines = System.IO.File.ReadAllLines(path);
bool readFlag = false;
foreach (string line in lines)
{
string text = Regex.Replace(line, @"\s+", "");
readFlag = checkSyntax(text);
if (readFlag)
{
string[] splitText = text.Split('=');
ht.Add(splitText[0].ToLower(), splitText[1]);
}
}
}
private bool checkSyntax(string line)
{
if (String.IsNullOrEmpty(line) || line[0].Equals('['))
{
return false;
}
if (line.Contains("=") && !String.IsNullOrEmpty(line.Split('=')[0]) && !String.IsNullOrEmpty(line.Split('=')[1]))
{
return true;
}
else
{
throw new Exception("Can not Parse Properties file please verify the syntax");
}
}
public string getProperty(string key)
{
if (ht.Contains(key))
{
return ht[key].ToString();
}
else
{
throw new Exception("Property:" + key + "Does not exist");
}
}
}
Hope this helps.
The real answer is no (at least not by itself). You can still write your own code to do it.
You can also use C# automatic property syntax with default values and a restrictive set. The advantage here is that you can then have any kind of data type in your properties "file" (now actually a class). The other advantage is that you can use C# property syntax to invoke the properties. However, you just need a couple of lines for each property (one in the property declaration and one in the constructor) to make this work.
using System;
namespace ReportTester {
class TestProperties
{
internal String ReportServerUrl { get; private set; }
internal TestProperties()
{
ReportServerUrl = "http://myhost/ReportServer/ReportExecution2005.asmx?wsdl";
}
}
}
Yet another answer (in January 2018) to the old question (in January 2009).
The specification of Java properties file is described in the JavaDoc of java.util.Properties.load(java.io.Reader). One problem is that the specification is a bit complicated than the first impression we may have. Another problem is that some answers here arbitrarily added extra specifications - for example, ; and ' are regarded as starters of comment lines but they should not be. Double/single quotations around property values are removed but they should not be.
The following are points to be considered.
\n, \r, \r\n or the end of the stream.\.\u0020), tab (\t, \u0009) and form feed (\f, \u000C).= is used as the separator between a key and a value.: is used as the separator between a key and a value, too.# or ! as its first non-white space characters, meaning leading white spaces before # or ! are allowed.\.=, : and white spaces can be embedded in a key if they are escaped by backslashes.\r and \n escape sequences.\uxxxx is used to represent a Unicode character.So, for example, if test.properties has the following content:
# A comment line that starts with '#'.
# This is a comment line having leading white spaces.
! A comment line that starts with '!'.
key1=value1
key2 : value2
key3 value3
key\
4=value\
4
\u006B\u0065\u00795=\u0076\u0061\u006c\u0075\u00655
\k\e\y\6=\v\a\lu\e\6
\:\ \= = \\colon\\space\\equal
it should be interpreted as the following key-value pairs.
+------+--------------------+
| KEY | VALUE |
+------+--------------------+
| key1 | value1 |
| key2 | value2 |
| key3 | value3 |
| key4 | value4 |
| key5 | value5 |
| key6 | value6 |
| : = | \colon\space\equal |
+------+--------------------+
PropertiesLoader class in Authlete.Authlete NuGet package can interpret the format of the specification. The example code below:
using System;
using System.IO;
using System.Collections.Generic;
using Authlete.Util;
namespace MyApp
{
class Program
{
public static void Main(string[] args)
{
string file = "test.properties";
IDictionary<string, string> properties;
using (TextReader reader = new StreamReader(file))
{
properties = PropertiesLoader.Load(reader);
}
foreach (var entry in properties)
{
Console.WriteLine($"{entry.Key} = {entry.Value}");
}
}
}
}
will generate this output:
key1 = value1
key2 = value2
key3 = value3
key4 = value4
key5 = value5
key6 = value6
: = = \colon\space\equal
An equivalent example in Java is as follows:
import java.util.*;
import java.io.*;
public class Program
{
public static void main(String[] args) throws IOException
{
String file = "test.properties";
Properties properties = new Properties();
try (Reader reader = new FileReader(file))
{
properties.load(reader);
}
for (Map.Entry<Object, Object> entry : properties.entrySet())
{
System.out.format("%s = %s\n", entry.getKey(), entry.getValue());
}
}
}
The source code, PropertiesLoader.cs, can be found in authlete-csharp. xUnit tests for PropertiesLoader are written in PropertiesLoaderTest.cs.
Final class. Thanks @eXXL.
public class Properties
{
private Dictionary<String, String> list;
private String filename;
public Properties(String file)
{
reload(file);
}
public String get(String field, String defValue)
{
return (get(field) == null) ? (defValue) : (get(field));
}
public String get(String field)
{
return (list.ContainsKey(field))?(list[field]):(null);
}
public void set(String field, Object value)
{
if (!list.ContainsKey(field))
list.Add(field, value.ToString());
else
list[field] = value.ToString();
}
public void Save()
{
Save(this.filename);
}
public void Save(String filename)
{
this.filename = filename;
if (!System.IO.File.Exists(filename))
System.IO.File.Create(filename);
System.IO.StreamWriter file = new System.IO.StreamWriter(filename);
foreach(String prop in list.Keys.ToArray())
if (!String.IsNullOrWhiteSpace(list[prop]))
file.WriteLine(prop + "=" + list[prop]);
file.Close();
}
public void reload()
{
reload(this.filename);
}
public void reload(String filename)
{
this.filename = filename;
list = new Dictionary<String, String>();
if (System.IO.File.Exists(filename))
loadFromFile(filename);
else
System.IO.File.Create(filename);
}
private void loadFromFile(String file)
{
foreach (String line in System.IO.File.ReadAllLines(file))
{
if ((!String.IsNullOrEmpty(line)) &&
(!line.StartsWith(";")) &&
(!line.StartsWith("#")) &&
(!line.StartsWith("'")) &&
(line.Contains('=')))
{
int index = line.IndexOf('=');
String key = line.Substring(0, index).Trim();
String value = line.Substring(index + 1).Trim();
if ((value.StartsWith("\"") && value.EndsWith("\"")) ||
(value.StartsWith("'") && value.EndsWith("'")))
{
value = value.Substring(1, value.Length - 2);
}
try
{
//ignore dublicates
list.Add(key, value);
}
catch { }
}
}
}
}
Sample use:
//load
Properties config = new Properties(fileConfig);
//get value whith default value
com_port.Text = config.get("com_port", "1");
//set value
config.set("com_port", com_port.Text);
//save
config.Save()
I don't know of any built-in way to do this. However, it would seem easy enough to do, since the only delimiters you have to worry about are the newline character and the equals sign.
It would be very easy to write a routine that will return a NameValueCollection, or an IDictionary given the contents of the file.
Yeah there's no built in classes to do this that I'm aware of.
But that shouldn't really be an issue should it? It looks easy enough to parse just by storing the result of Stream.ReadToEnd() in a string, splitting based on new lines and then splitting each record on the = character. What you'd be left with is a bunch of key value pairs which you can easily toss into a dictionary.
Here's an example that might work for you:
public static Dictionary<string, string> GetProperties(string path)
{
string fileData = "";
using (StreamReader sr = new StreamReader(path))
{
fileData = sr.ReadToEnd().Replace("\r", "");
}
Dictionary<string, string> Properties = new Dictionary<string, string>();
string[] kvp;
string[] records = fileData.Split("\n".ToCharArray());
foreach (string record in records)
{
kvp = record.Split("=".ToCharArray());
Properties.Add(kvp[0], kvp[1]);
}
return Properties;
}
Here's an example of how to use it:
Dictionary<string,string> Properties = GetProperties("data.txt");
Console.WriteLine("Hello: " + Properties["Hello"]);
Console.ReadKey();
I realize that this isn't exactly what you're asking, but just in case:
When you want to load an actual Java properties file, you'll need to accomodate its encoding. The Java docs indicate that the encoding is ISO 8859-1, which contains some escape sequences that you might not correctly interpret. For instance look at this SO answer to see what's necessary to turn UTF-8 into ISO 8859-1 (and vice versa)
When we needed to do this, we found an open-source PropertyFile.cs and made a few changes to support the escape sequences. This class is a good one for read/write scenarios. You'll need the supporting PropertyFileIterator.cs class as well.
Even if you're not loading true Java properties, make sure that your prop file can express all the characters you need to save (UTF-8 at least)
Yeah there's no built in classes to do this that I'm aware of.
But that shouldn't really be an issue should it? It looks easy enough to parse just by storing the result of Stream.ReadToEnd() in a string, splitting based on new lines and then splitting each record on the = character. What you'd be left with is a bunch of key value pairs which you can easily toss into a dictionary.
Here's an example that might work for you:
public static Dictionary<string, string> GetProperties(string path)
{
string fileData = "";
using (StreamReader sr = new StreamReader(path))
{
fileData = sr.ReadToEnd().Replace("\r", "");
}
Dictionary<string, string> Properties = new Dictionary<string, string>();
string[] kvp;
string[] records = fileData.Split("\n".ToCharArray());
foreach (string record in records)
{
kvp = record.Split("=".ToCharArray());
Properties.Add(kvp[0], kvp[1]);
}
return Properties;
}
Here's an example of how to use it:
Dictionary<string,string> Properties = GetProperties("data.txt");
Console.WriteLine("Hello: " + Properties["Hello"]);
Console.ReadKey();
C# generally uses xml-based config files rather than the *.ini-style file like you said, so there's nothing built-in to handle this. However, google returns a number of promising results.
Yet another answer (in January 2018) to the old question (in January 2009).
The specification of Java properties file is described in the JavaDoc of java.util.Properties.load(java.io.Reader). One problem is that the specification is a bit complicated than the first impression we may have. Another problem is that some answers here arbitrarily added extra specifications - for example, ; and ' are regarded as starters of comment lines but they should not be. Double/single quotations around property values are removed but they should not be.
The following are points to be considered.
\n, \r, \r\n or the end of the stream.\.\u0020), tab (\t, \u0009) and form feed (\f, \u000C).= is used as the separator between a key and a value.: is used as the separator between a key and a value, too.# or ! as its first non-white space characters, meaning leading white spaces before # or ! are allowed.\.=, : and white spaces can be embedded in a key if they are escaped by backslashes.\r and \n escape sequences.\uxxxx is used to represent a Unicode character.So, for example, if test.properties has the following content:
# A comment line that starts with '#'.
# This is a comment line having leading white spaces.
! A comment line that starts with '!'.
key1=value1
key2 : value2
key3 value3
key\
4=value\
4
\u006B\u0065\u00795=\u0076\u0061\u006c\u0075\u00655
\k\e\y\6=\v\a\lu\e\6
\:\ \= = \\colon\\space\\equal
it should be interpreted as the following key-value pairs.
+------+--------------------+
| KEY | VALUE |
+------+--------------------+
| key1 | value1 |
| key2 | value2 |
| key3 | value3 |
| key4 | value4 |
| key5 | value5 |
| key6 | value6 |
| : = | \colon\space\equal |
+------+--------------------+
PropertiesLoader class in Authlete.Authlete NuGet package can interpret the format of the specification. The example code below:
using System;
using System.IO;
using System.Collections.Generic;
using Authlete.Util;
namespace MyApp
{
class Program
{
public static void Main(string[] args)
{
string file = "test.properties";
IDictionary<string, string> properties;
using (TextReader reader = new StreamReader(file))
{
properties = PropertiesLoader.Load(reader);
}
foreach (var entry in properties)
{
Console.WriteLine($"{entry.Key} = {entry.Value}");
}
}
}
}
will generate this output:
key1 = value1
key2 = value2
key3 = value3
key4 = value4
key5 = value5
key6 = value6
: = = \colon\space\equal
An equivalent example in Java is as follows:
import java.util.*;
import java.io.*;
public class Program
{
public static void main(String[] args) throws IOException
{
String file = "test.properties";
Properties properties = new Properties();
try (Reader reader = new FileReader(file))
{
properties.load(reader);
}
for (Map.Entry<Object, Object> entry : properties.entrySet())
{
System.out.format("%s = %s\n", entry.getKey(), entry.getValue());
}
}
}
The source code, PropertiesLoader.cs, can be found in authlete-csharp. xUnit tests for PropertiesLoader are written in PropertiesLoaderTest.cs.
There are several NuGet packages for this, but all are currently in pre-release version.
[Update] As of June 2018, Capgemini.Cauldron.Core.JavaProperties is now in a stable version (version 2.1.0 and 3.0.20).
I don't know of any built-in way to do this. However, it would seem easy enough to do, since the only delimiters you have to worry about are the newline character and the equals sign.
It would be very easy to write a routine that will return a NameValueCollection, or an IDictionary given the contents of the file.
Most Java ".properties" files can be split by assuming the "=" is the separator - but the format is significantly more complicated than that and allows for embedding spaces, equals, newlines and any Unicode characters in either the property name or value.
I needed to load some Java properties for a C# application so I have implemented JavaProperties.cs to correctly read and write ".properties" formatted files using the same approach as the Java version - you can find it at http://www.kajabity.com/index.php/2009/06/loading-java-properties-files-in-csharp/.
There, you will find a zip file containing the C# source for the class and some sample properties files I tested it with.
Enjoy!
Final class. Thanks @eXXL.
public class Properties
{
private Dictionary<String, String> list;
private String filename;
public Properties(String file)
{
reload(file);
}
public String get(String field, String defValue)
{
return (get(field) == null) ? (defValue) : (get(field));
}
public String get(String field)
{
return (list.ContainsKey(field))?(list[field]):(null);
}
public void set(String field, Object value)
{
if (!list.ContainsKey(field))
list.Add(field, value.ToString());
else
list[field] = value.ToString();
}
public void Save()
{
Save(this.filename);
}
public void Save(String filename)
{
this.filename = filename;
if (!System.IO.File.Exists(filename))
System.IO.File.Create(filename);
System.IO.StreamWriter file = new System.IO.StreamWriter(filename);
foreach(String prop in list.Keys.ToArray())
if (!String.IsNullOrWhiteSpace(list[prop]))
file.WriteLine(prop + "=" + list[prop]);
file.Close();
}
public void reload()
{
reload(this.filename);
}
public void reload(String filename)
{
this.filename = filename;
list = new Dictionary<String, String>();
if (System.IO.File.Exists(filename))
loadFromFile(filename);
else
System.IO.File.Create(filename);
}
private void loadFromFile(String file)
{
foreach (String line in System.IO.File.ReadAllLines(file))
{
if ((!String.IsNullOrEmpty(line)) &&
(!line.StartsWith(";")) &&
(!line.StartsWith("#")) &&
(!line.StartsWith("'")) &&
(line.Contains('=')))
{
int index = line.IndexOf('=');
String key = line.Substring(0, index).Trim();
String value = line.Substring(index + 1).Trim();
if ((value.StartsWith("\"") && value.EndsWith("\"")) ||
(value.StartsWith("'") && value.EndsWith("'")))
{
value = value.Substring(1, value.Length - 2);
}
try
{
//ignore dublicates
list.Add(key, value);
}
catch { }
}
}
}
}
Sample use:
//load
Properties config = new Properties(fileConfig);
//get value whith default value
com_port.Text = config.get("com_port", "1");
//set value
config.set("com_port", com_port.Text);
//save
config.Save()
You can also use C# automatic property syntax with default values and a restrictive set. The advantage here is that you can then have any kind of data type in your properties "file" (now actually a class). The other advantage is that you can use C# property syntax to invoke the properties. However, you just need a couple of lines for each property (one in the property declaration and one in the constructor) to make this work.
using System;
namespace ReportTester {
class TestProperties
{
internal String ReportServerUrl { get; private set; }
internal TestProperties()
{
ReportServerUrl = "http://myhost/ReportServer/ReportExecution2005.asmx?wsdl";
}
}
}
I don't know of any built-in way to do this. However, it would seem easy enough to do, since the only delimiters you have to worry about are the newline character and the equals sign.
It would be very easy to write a routine that will return a NameValueCollection, or an IDictionary given the contents of the file.
I don't know of any built-in way to do this. However, it would seem easy enough to do, since the only delimiters you have to worry about are the newline character and the equals sign.
It would be very easy to write a routine that will return a NameValueCollection, or an IDictionary given the contents of the file.
C# generally uses xml-based config files rather than the *.ini-style file like you said, so there's nothing built-in to handle this. However, google returns a number of promising results.
I realize that this isn't exactly what you're asking, but just in case:
When you want to load an actual Java properties file, you'll need to accomodate its encoding. The Java docs indicate that the encoding is ISO 8859-1, which contains some escape sequences that you might not correctly interpret. For instance look at this SO answer to see what's necessary to turn UTF-8 into ISO 8859-1 (and vice versa)
When we needed to do this, we found an open-source PropertyFile.cs and made a few changes to support the escape sequences. This class is a good one for read/write scenarios. You'll need the supporting PropertyFileIterator.cs class as well.
Even if you're not loading true Java properties, make sure that your prop file can express all the characters you need to save (UTF-8 at least)
C# generally uses xml-based config files rather than the *.ini-style file like you said, so there's nothing built-in to handle this. However, google returns a number of promising results.
I've written a method that allows emty lines, outcommenting and quoting within the file.
Examples:
var1="value1"
var2='value2'
'var3=outcommented
;var4=outcommented, too
Here's the method:
public static IDictionary ReadDictionaryFile(string fileName)
{
Dictionary<string, string> dictionary = new Dictionary<string, string>();
foreach (string line in File.ReadAllLines(fileName))
{
if ((!string.IsNullOrEmpty(line)) &&
(!line.StartsWith(";")) &&
(!line.StartsWith("#")) &&
(!line.StartsWith("'")) &&
(line.Contains('=')))
{
int index = line.IndexOf('=');
string key = line.Substring(0, index).Trim();
string value = line.Substring(index + 1).Trim();
if ((value.StartsWith("\"") && value.EndsWith("\"")) ||
(value.StartsWith("'") && value.EndsWith("'")))
{
value = value.Substring(1, value.Length - 2);
}
dictionary.Add(key, value);
}
}
return dictionary;
}
The real answer is no (at least not by itself). You can still write your own code to do it.
There are several NuGet packages for this, but all are currently in pre-release version.
[Update] As of June 2018, Capgemini.Cauldron.Core.JavaProperties is now in a stable version (version 2.1.0 and 3.0.20).
Most Java ".properties" files can be split by assuming the "=" is the separator - but the format is significantly more complicated than that and allows for embedding spaces, equals, newlines and any Unicode characters in either the property name or value.
I needed to load some Java properties for a C# application so I have implemented JavaProperties.cs to correctly read and write ".properties" formatted files using the same approach as the Java version - you can find it at http://www.kajabity.com/index.php/2009/06/loading-java-properties-files-in-csharp/.
There, you will find a zip file containing the C# source for the class and some sample properties files I tested it with.
Enjoy!
No there is not : But I have created one easy class to help :
public class PropertiesUtility
{
private static Hashtable ht = new Hashtable();
public void loadProperties(string path)
{
string[] lines = System.IO.File.ReadAllLines(path);
bool readFlag = false;
foreach (string line in lines)
{
string text = Regex.Replace(line, @"\s+", "");
readFlag = checkSyntax(text);
if (readFlag)
{
string[] splitText = text.Split('=');
ht.Add(splitText[0].ToLower(), splitText[1]);
}
}
}
private bool checkSyntax(string line)
{
if (String.IsNullOrEmpty(line) || line[0].Equals('['))
{
return false;
}
if (line.Contains("=") && !String.IsNullOrEmpty(line.Split('=')[0]) && !String.IsNullOrEmpty(line.Split('=')[1]))
{
return true;
}
else
{
throw new Exception("Can not Parse Properties file please verify the syntax");
}
}
public string getProperty(string key)
{
if (ht.Contains(key))
{
return ht[key].ToString();
}
else
{
throw new Exception("Property:" + key + "Does not exist");
}
}
}
Hope this helps.
Source: Stackoverflow.com