我有一个像这样的GridView:
<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>
以下是我创建GridView绑定的DataTable的方法,以便您知道我正在处理的数据:
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,为什么RowDeleting事件的EventArgs中没有传递密钥?我需要从ADO.NET DataTable中删除记录此事件时我保持会话状态的记录。
为什么这不起作用? DataKeys只在使用DataSource控件时才起作用吗?
答案 0 :(得分:8)
这有效:
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();
}
答案 1 :(得分:1)
将GridView控件的DataKeyNames属性设置为数据主键的名称。
https://msdn.microsoft.com/en-us/library/system.web.ui.webcontrols.gridview.datakeynames.aspx
答案 2 :(得分:0)
添加
<asp:BoundField DataField="ID" />
并查看该字段是否有值。