How do you Sort a DataTable given column and direction

Question

I need to resort  in memory  a DataTable based on a column and direction that are coming from a GridView  The function needs to look like this   public static DataTable resort DataTable dt  string colName  string direction        DataTable dtOut   null                I need help filling in this function  I think I can use a Select statement but I am not sure how  I can t click on Comments because of this browser but you can show me an in-place or new DataTable solution  either one  For the people showing me pointers  please  I need a coded function similar to the one prototyped   How about      ds Tables 0  DefaultView Sort  au fname DESC      public static void Resort ref DataTable dt  string colName  string direction               string sortExpression   string Format   0   1    colName  direction           dt DefaultView Sort   sortExpression

User · Answer

I assume  direction  is  ASC  or  DESC  and dt contains a column named  colName   public static DataTable resort DataTable dt  string colName  string direction        DataTable dtOut   null      dt DefaultView Sort   colName         direction      dtOut   dt DefaultView ToTable        return dtOut      OR without creating dtOut  public static DataTable resort DataTable dt  string colName  string direction        dt DefaultView Sort   colName         direction      dt   dt DefaultView ToTable        return dt

User · Answer

DataTables have an overloaded Select method that you can you to do this  See here  http   msdn microsoft com en-us library way3dy9w aspx  But the return val of the Select call is not a DataTable but an array of RowData objects  If you want to return a DataTable from your function you will have to build it from scratch based on that data array  Here is a post that addresses and provides a sample for both issues  http   social msdn microsoft com Forums en-US winformsdatacontrols thread 157a4a0f-1324-4301-9725-3def95de2bf2

User · Answer

In case you want to sort in more than one direction    public static void sortOutputTable ref DataTable output                        DataView dv   output DefaultView              dv Sort    specialCode ASC  otherCode DESC               DataTable sortedDT   dv ToTable                output   sortedDT

User · Answer

If you ve only got one DataView  you can sort using that instead   table DefaultView Sort    columnName asc     Haven t tried it  but I guess you can do this with any number of DataViews  as long as you reference the right one

User · Answer

Create a DataView  You cannot sort a DataTable directly  but you can create a DataView from the DataTable and sort that   Creating  http   msdn microsoft com en-us library hy5b8exc aspx  Sorting  http   msdn microsoft com en-us library 13wb36xf aspx     The following code example creates a view that shows all the products   where the number of units in stock is less than or equal to the   reorder level  sorted first by supplier ID and then by product name    DataView prodView   new DataView prodDS Tables  Products        UnitsInStock  lt   ReorderLevel       SupplierID  ProductName      DataViewRowState CurrentRows

User · Answer

Actually got the same problem  For me worked this easy way   Adding the data to a Datatable and sort it   dt DefaultView Sort    columnname   dt   dt DefaultView ToTable

[c#] How do you Sort a DataTable given column and direction?

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