GridView设置多个DatakeyNames

aspx设置:
<asp:GridView ID="grvGrid" runat="server" DataKeyNames="Id,Time"></asp:GridView>
aspx.cs获取：
protected void grvGrid_SelectedIndexChanging(object sender, GridViewSelectEventArgs e)
{
    string id = grvGrid.DataKeys[e.NewSelectedIndex][0].ToString();
    string time=grvGrid.DataKeys[e.NewSelectedIndex]["Time"].ToString();
}

初始化DataKeyNames时：   GridView1.DataKeyNames=Gridview1.DataKeyNames = new string[] { "PositionID", "DepartmentID" };获取：
protected void Gridview1_RowDeleting(object sender, GridViewDeleteEventArgs e)
        {
            string positionID = Gridview1.DataKeys[e.RowIndex]["PositionID"].ToString();
        }