sort columns of gridview in asp.net c#

Question

Can anyone tell the function to sort the columns of a gridview in c# asp.net.

The databound to gridview is from datacontext created using linq. I wanted to click th

Answer 1

http://msdn.microsoft.com/en-us/library/ms745786.aspx

http://aspnet.4guysfromrolla.com/articles/012308-1.aspx

Answer 2

add:

  AllowSorting="true"

to the <asp:GridView /> tag, that should do it

Answer 3

In Half Pseudocode for SQL Query

string Query= string.Empty;
string SortExpression = string.Empty;

// HDFSort is an HiddenField !!!

protected void SortCommand_OnClick(object sender, GridViewSortEventArgs e)
{
   SortExpression = e.SortExpression; 
   Query = YourQuery + " ORDER BY "+SortExpression +" "+ HDFSort.Value ;
   HDFSort.Value = HDFSort.Value== "ASC" ? "DESC" : "ASC";
   RefreshGridView();
}

protected void RefreshGridView()
{
   GridView1.DataSource = DBObject.GetData(Query);
   GridView1.DataBind();
}

Answer 4

In the Properties Panel double Click on the Sorting Entry. A new Function will be created. In this Function write the Code to fill the Gridview. The only difference is to change the query based on GridViewSortEventArgs e

e.SortExpression and
e.SortDirection allways Ascending :-(

I hope this very short Answer helps

Answer 5

There are 2 things you need to do to get this right.

1. Keep the sorting state is viewstate(SortDirection and SortExpression)
2. You generate the correct linq expression based on the current sorting state.

Manually handle the Sorting event in the grid and use this helper I wrote to sort by SortExpression and SortDirection:

public static IQueryable<T> SortBy<T>(IQueryable<T> source, string sortExpression, SortDirection direction) {
    if (source == null) {
        throw new ArgumentNullException("source");
    }

    string methodName = "OrderBy";
    if (direction == SortDirection.Descending) {
        methodName += "Descending";
    }

    var paramExp = Expression.Parameter(typeof(T), String.Empty);
    var propExp = Expression.PropertyOrField(paramExp, sortExpression);

    // p => p.sortExpression
    var sortLambda = Expression.Lambda(propExp, paramExp);

    var methodCallExp = Expression.Call(
                                typeof(Queryable),
                                methodName,
                                new[] { typeof(T), propExp.Type },
                                source.Expression,
                                Expression.Quote(sortLambda)
                            );

    return (IQueryable<T>)source.Provider.CreateQuery(methodCallExp);
}

db.Products.SortBy(e.SortExpression, e.SortDirection)

Check out my blog post on how to do this:

Answer 6

more information on sorting in a gridview can be found here: MSDN Gridview sorting the methodology used to get the data should not matter, you can use the same sorting.