1. 首先在初始化Gridview時候定義主鍵的數組。
GridViewTeacherStudent.DataKeyNames=new string[] {"courseId","studentId","type","level","unit"};
2. 在進行刪除操作，或者對某行進行操作獲得列中的值。
string studentId = GridViewTeacherStudent.DataKeys[e.RowIndex]["studentId"].ToString().Trim();
3.如果只有單個的鍵值時候。如只有”StudentId“一個主鍵下面直接獲得。
string studentId = GridViewTeacherStudent.DataKeys[e.RowIndex].Value.ToString().Trim();
在 GridView1_RowCommand中獲取主鍵的值：
protected void GridView1_RowCommand(object sender, GridViewCommandEventArgs e)
{
int OrderId = Convert.ToInt32(GridView1.DataKeys[Convert.ToInt32(e.CommandArgument)].Value); }
在 GridView1_PageIndexChanging中獲取主鍵的值
protected void GridView1_PageIndexChanging(object sender, GridViewPageEventArgs e)
{
int index=GridView1.DataKeys[e.NewPageIndex].Value;
}
在 GridView1_RowDeleting中獲取主鍵的值
protected void GridView1_RowDeleting(object sender, GridViewDeleteEventArgs e)
{
int index=GridView1.DataKeys[e.RowIndex].Value;
}
在 GridView1_RowEditing中獲取主鍵的值
protected void GridView1_RowEditing(object sender, GridViewEditEventArgs e)
{
int index = GridView1.DataKeys[e.NewEditIndex].Value;
}
在 GridView1_RowUpdating中獲取主鍵的值
protected void GridView1_RowUpdating(object sender, GridViewUpdateEventArgs e)
{
int index = GridView1.DataKeys[e.RowIndex].Value;
}
在 GridView1_RowDataBound中獲取主鍵的值
protected void GridView1_RowDataBound(object sender, GridViewRowEventArgs e)
{
int index = GridView1.DataKeys[e.Row.RowIndex].Value;
}