DatagridView sorting in winforms

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hi,
I have used the below code on datagridview1_ColumnHeaderMouseClick

C#

foreach (DataGridViewColumn x in datagridview1.Columns)
            {
                x.SortMode = DataGridViewColumnSortMode.Automatic;
                x.Selected = true;
            }

sorting is not happening ...please help me regarding the same....

even i have tried...
private int Order=-1;

the below code is inside datagridview1_ColumnHeaderMouseClick

ListSortDirection sortDirection;
if (this.datagridview1.SortedColumn.Name == "Number")
            {
                if (this.Order == -1)
                {
                    sortDirection = ListSortDirection.Descending;
                    datagridview1.Sort(datagridview1.Columns["Number"], sortDirection);
                    datagridview1.Columns[e.ColumnIndex].HeaderCell.SortGlyphDirection = System.Windows.Forms.SortOrder.Descending;
                    this.Order = 1;
                }
                else
                {
                    sortDirection = ListSortDirection.Ascending;
                    datagridview1.Sort(datagridview1.Columns["Number"], sortDirection);
                    datagridview1.Columns[e.ColumnIndex].HeaderCell.SortGlyphDirection = System.Windows.Forms.SortOrder.Ascending;
                    this.Order = -1;
                }
            }

even the above code is not working....

[edit]Code block added - OriginalGriff[/edit]

Posted 10-May-11 4:12am

siva455

Updated 10-May-11 4:46am

OriginalGriff

v5

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Arun_Reddy · Answer 1 · 2011-05-10T04:48:00

private const string ASCENDING = " ASC";
private const string DESCENDING = " DESC";
public SortDirection GridViewSortDirection 
{
     	get
     	{
                if (ViewState["sortDirection"] == null)
		ViewState["sortDirection"] = SortDirection.Ascending;
          	return (SortDirection) ViewState["sortDirection"];              
     	}
     	set
	{
		 ViewState["sortDirection"] = value; 
	}
}
protected void GridView_Sorting(object sender,GridViewSortEventArgs e)
{
	 string sortExpression = e.SortExpression;
      if (GridViewSortDirection == SortDirection.Ascending)     
	{
         GridViewSortDirection = SortDirection.Descending;
         SortGridView(sortExpression, DESCENDING);
        } 
      else  
        {
         GridViewSortDirection = SortDirection.Ascending;
         SortGridView(sortExpression, ASCENDING);
      	}
}
private void SortGridView(string sortExpression,string direction) 
{
     //  You can cache the DataTable for improving performance     
	DataTable dt = GetData().Tables[0];
        DataView dv = new DataView(dt);
        dv.Sort = sortExpression + direction;
        GridView1.DataSource = dv;
        GridView1.DataBind();
}

tesnep · Answer 2 · 2015-06-18T16:09:00

Since nobody wanted to answer this, I thought I'd answer it.

The problem is in the custom binding source. Auto Sort will not work when custom binding source is used.

So you need to remove the line:

datagridview1.Sort(datagridview1.Columns["Number"], sortDirection);

Instead after you fetch data apply sorting logic like this:

private IEnumerable<patient> GetSortedModel(IModel<patient> model, int? sortColumnIndex, ListSortDirection? sortDirection)
       {
           if (sortColumnIndex != null)
           {

               if (sortDirection == ListSortDirection.Ascending)
               {
                   switch (sortColumnIndex)
                   {
                       case 0:
                           return model.GetList().OrderBy(x => x.FacilityName).ThenBy(x => x.Name);
                       case 1:
                           return model.GetList().OrderBy(x => x.ID).ThenBy(x => x.Name);
                       case 2:
                           return model.GetList().OrderBy(x => x.Name).ThenBy(x =>x.Name);
                       ....
                   }
               }
               else
               {
                   switch (sortColumnIndex)
                   {
                       case 0:
                           return model.GetList().OrderByDescending(x => x.FacilityName).ThenBy(x => x.Name);
                       case 1:
                           return model.GetList().OrderByDescending(x => x.ID).ThenBy(x => x.Name);
                       case 2:
                           return model.GetList().OrderByDescending(x => x.Name).ThenBy(x => x.Name);
                       ....
                   }

               }
           }

           return model.GetList().OrderBy(x => x.Name);
       }</patient></patient>

And then apply the datasource.

datagridview1.source = new BindingSource { DataSource = model};

DatagridView sorting in winforms

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