Calling a function from a string in C

Question

I know in php you are able to make a call like    function name    hello    function name     function hello     echo  hello       Is this possible in  Net

User · Answer

You can invoke methods of a class instance using reflection, doing a dynamic method invocation:

Suppose that you have a method called hello in a the actual instance (this):

string methodName = "hello";

//Get the method information using the method info class
 MethodInfo mi = this.GetType().GetMethod(methodName);

//Invoke the method
// (null- no parameter for the method call
// or you can pass the array of parameters...)
mi.Invoke(this, null);

User · Answer

This code works in my console  Net application class Program       static void Main string   args                string method   args 0      get name method         CallMethod method                  public static void CallMethod string method                try                       Type type   typeof Program               MethodInfo methodInfo   type GetMethod method               methodInfo Invoke method  null                     catch Exception ex                        Console WriteLine  quot Error   quot    ex Message               Console ReadKey                             public static void Hello                 string a    quot hello world  quot           Console WriteLine a           Console ReadKey

User · Answer

class Program               static void Main string   args                        Type type   typeof MyReflectionClass               MethodInfo method   type GetMethod  MyMethod                MyReflectionClass c   new MyReflectionClass                string result    string method Invoke c  null               Console WriteLine result                         public class MyReflectionClass               public string MyMethod                         return DateTime Now ToString

User · Answer

Yes  You can use reflection  Something like this   Type thisType   this GetType    MethodInfo theMethod   thisType GetMethod TheCommandString   theMethod Invoke this  userParameters

User · Answer

A slight tangent -- if you want to parse and evaluate an entire expression string which contains  nested   functions  consider NCalc  http   ncalc codeplex com  and nuget   Ex  slightly modified from the project documentation      the expression to evaluate  e g  from user input  like a calculator program  hint hint college students  var exprStr    10   MyFunction 3  6    Expression e   new Expression exprString       tell it how to handle your custom function e EvaluateFunction    delegate string name  FunctionArgs args            if  name     MyFunction               args Result    int args Parameters 0  Evaluate      int args Parameters 1  Evaluate               confirm it worked Debug Assert 19    e Evaluate       And within the EvaluateFunction delegate you would call your existing function

User · Answer

In C   you can create delegates as function pointers   Check out the following MSDN article for information on usage  http   msdn microsoft com en-us library ms173171 VS 80  aspx      public static void hello                 Console Write  hello world                 code snipped         public delegate void functionPointer         functionPointer foo   hello      foo        Writes hello world to the console

[c#] Calling a function from a string in C#

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