“DropDownList1”有一个无效 SelectedValue，因为它不在项目列表中。
2个表table1,table2
table1列：id,name
table2列：id,name,sort1 //table1的name=table2的sort1
DropDownList1绑定table1
GridView1绑定table2
点修改，DropDownList1显示相应的 一级分类
protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
{
SqlConnection conn = new SqlConnection(ConnectionString);
string sql = "select * from table1";
SqlDataAdapter da = new SqlDataAdapter(sql, conn);
DataSet ds = new DataSet();
da.Fill(ds);
DropDownList1.DataSource = ds;
DropDownList1.DataTextField = "name";
DropDownList1.DataValueField = "name";
DropDownList1.DataBind();
string sql2 = "select * from table2";
SqlDataAdapter da2 = new SqlDataAdapter(sql2, conn);
DataSet ds2 = new DataSet();
da2.Fill(ds2);
GridView1.DataSource = ds2;
GridView1.DataBind();
}
}
protected void GridView1_RowCommand(object sender, GridViewCommandEventArgs e)
{
int index = int.Parse(e.CommandArgument.ToString());
int id = int.Parse(this.GridView1.DataKeys[index].Value.ToString());
if (e.CommandName == "Edit")
{
SqlConnection conn = new SqlConnection(ConnectionString);
string sql = "select * from table2 where id=" + id + "";
SqlDataAdapter da = new SqlDataAdapter(sql, conn);
DataSet ds = new DataSet();
da.Fill(ds);
DropDownList1.SelectedValue = ds.Tables[0].Rows[0]["sort1"].ToString();
//Response.Write(ds.Tables[0].Rows[0]["sort1"].ToString());
}
}
protected void GridView1_RowEditing(object sender, GridViewEditEventArgs e)
{
}
