GridView Hierarchy

[Praveen Kumar]

I am using Hierarchy grid view
what i need is how can expand or collapse all childtemplates in the Hierarchy grid view 
And also suggest me how to know all the features of Hierarchy grid view (can i display total number of records on top of each childtemplate...)

[Jack]

Hello Praveen Kumar ,

You can expand all child views by iterating over all parent rows and setting the IsExpanded property to true. You should call the BeginUpdate and EndUpdate methods to avoid unnecessary updates. Please take a look at the code snippet below:

radGridView1.GridElement.BeginUpdate();
foreach (GridViewDataRowInfo row in radGridView1.Rows)
{
    row.IsExpanded = true;
}
radGridView1.GridElement.EndUpdate();

You should use a custom cell to show the number of records available in the child view. To do this, create a new cell element that inherits from GridDataCellElement and handle its SetContentCore method. You should also handle CreateCell event and to add an unbound textbox column to your grid. Here is the code:

this.radGridView1.CreateCell += new GridViewCreateCellEventHandler(radGridView1_CreateCell);
this.radGridView1.Columns.Add(new GridViewTextBoxColumn("ChildRows", ""));
this.radGridView1.Columns["ChildRows"].ReadOnly = true;

void radGridView1_CreateCell(object sender, GridViewCreateCellEventArgs e)
{
    if (e.Row is GridDataRowElement && e.Column.HeaderText == "ChildRows")
    {
        e.CellElement = new MyDataCell(e.Column, e.Row);
    }
}

public class MyDataCell : GridDataCellElement
{
    public MyDataCell(GridViewColumn column, GridRowElement row)
        : base(column, row)
    {
    }

    protected override void SetContentCore(object value)
    {
        GridViewDataRowInfo rowInfo = (GridViewDataRowInfo)this.RowInfo;
        GridViewRowInfo[] rows = rowInfo.ViewTemplate.ChildGridViewTemplates[0].GetChildRows(rowInfo);
        if (rows != null && rows.Length > 0)
        {
            this.Text = rows.Length.ToString();
            return;
        }
        this.Text = "";
    }
}

To get the number of all rows inside the child template, just check the Count property of its Rows collection:

int totalChildRowsCount = this.radGridView1.MasterGridViewTemplate.ChildGridViewTemplates[0].Rows.Count;

I hope this helps. If you have more questions, I will be glad to answer.

All the best,
Jack
the Telerik team

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