ASP.NET - Gridview RowDeleting事件上没有Datakey！

Question

我有一个GridView就这样：

<asp:GridView ID="gvwStudents" runat="server" 
    AutoGenerateColumns="False" DataKeyNames="ID" 
    ShowHeader="False" onrowdeleting="gvwStudents_RowDeleting"> 
    <Columns> 
     <asp:BoundField DataField="FirstName" /> 
     <asp:BoundField DataField="LastName" /> 
     <asp:BoundField DataField="Email" /> 
     <asp:CommandField ShowDeleteButton="True" DeleteText="Remove" /> 
    </Columns> 
</asp:GridView> 

这里是我如何创建我的DataTable，该GridView控件绑定到，让你知道我处理什么数据：

private DataTable MakeStudentsTable() 
{ 
    DataTable students = new DataTable(); 

    DataColumn ID = students.Columns.Add("ID", typeof(int)); 
    ID.AutoIncrement = true; 

    DataColumn firstName = students.Columns.Add("FirstName", typeof(string)); 
    DataColumn lastName = students.Columns.Add("LastName", typeof(string)); 
    DataColumn email = students.Columns.Add("Email", typeof(string)); 


    return students; 
} 

为什么哦，为什么没有在RowDeleting事件的EventArgs中传递键？我需要从ADO.NET DataTable中删除记录，这些记录是在触发此事件时保留在会话状态中的。

为什么不能正常工作？ DataKeys仅在使用DataSource控件时才起作用吗？

Answer 1

这工作：

private DataTable MakeStudentsTable() 
{ 
    DataTable students = new DataTable(); 

    DataColumn ID = students.Columns.Add("ID", typeof(int)); 
    ID.AutoIncrement = true; 

    DataColumn firstName = students.Columns.Add("FirstName", typeof(string)); 
    DataColumn lastName = students.Columns.Add("LastName", typeof(string)); 
    DataColumn email = students.Columns.Add("Email", typeof(string)); 

    DataRow student = students.NewRow(); 
    student["FirstName"] = "foo"; 
    student["LastName"] = "bar"; 
    student["Email"] = "foo@bar.com"; 
    students.Rows.Add(student); 

    return students; 
} 

protected void gvwStudents_RowDeleting(object sender, GridViewDeleteEventArgs e) 
{ 
    string id = this.gvwStudents.DataKeys[e.RowIndex].Value.ToString(); 
} 

Answer 2

添加

<asp:BoundField DataField="ID" /> 

，看看现场，甚至有一个值。

Answer 3

设置GridView控件到您的数据的主键（一个或多个）的姓名（或名称）的DataKeyNames属性。

https://msdn.microsoft.com/en-us/library/system.web.ui.webcontrols.gridview.datakeynames.aspx