[英]Deleting record from gridview in ASP.NET application
我在页面上具有以下gridview,以显示具有“审阅者”角色的用户。 网格正确提取记录。 在gridview上是一个“删除”按钮,用于删除Reviewer角色。 手动运行时,被调用的存储过程正常工作,但是我似乎在aspx或codebehind页面上缺少某些内容,因为没有错误返回,也没有删除任何记录。
gridview的aspx控件:
<asp:GridView ID="GridView1" runat="server" Caption="Current Reviewers" AllowSorting="True" PagerSettings-Mode="NumericFirstLast" OnPageIndexChanging="GridView1_PageIndexChanging"
CaptionAlign="Top" EmptyDataText="No Reviewers Configured." PageSize="10" AllowPaging="true" PagerStyle-HorizontalAlign="Center" PagerStyle-Font-Size="Large"
AutoGenerateColumns="false" AlternatingRowStyle-BackColor="#cccccc" DataKeyNames="UserId" OnRowDeleting="DeleteRecord">
<Columns>
<asp:BoundField DataField="UserId" HeaderText="Id" ItemStyle-Width="300" />
<asp:BoundField DataField="Name" HeaderText="Name" ItemStyle-Width="250" />
<asp:TemplateField HeaderText="Delete?">
<ItemTemplate>
<span onclick="return confirm('Are you sure to Delete the record?')">
<asp:LinkButton ID="lnkB" runat="Server" Text="Delete" CommandArgument='<%# Eval("UserId") %>' CommandName="DeleteRecord"></asp:LinkButton>
</span>
</ItemTemplate>
</asp:TemplateField>
</Columns>
</asp:GridView>
更新后带有完整代码:
namespace cs1.Admin
{
public partial class ReviewerMaintenance : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
{
BindDropDownList1();
}
}
private void BindDropDownList1()
{
string connectionString = WebConfigurationManager.ConnectionStrings["DefaultConnection"].ConnectionString;
string selectSQL = String.Format("SELECT Id as UserId, FirstName + ' ' + LastName As Name from AspNetUsers where Id in(SELECT UserId from AspNetUserRoles where RoleId = 1)");
SqlConnection con = new SqlConnection(connectionString);
SqlCommand cmd = new SqlCommand(selectSQL, con);
SqlDataAdapter adapter = new SqlDataAdapter(cmd);
DataSet ds = new DataSet();
adapter.Fill(ds, "Reviewer");
GridView1.DataSource = ds;
GridView1.DataBind();
}
protected void GridView1_PageIndexChanging(object sender, GridViewPageEventArgs e)
{
GridView1.PageIndex = e.NewPageIndex;
BindDropDownList1(); //bindgridview will get the data source and bind it again
}
protected void DeleteRecord(object sender, GridViewDeleteEventArgs e)
{
string UserId = GridView1.DataKeys[e.RowIndex].Value.ToString();
SqlConnection conn = new SqlConnection(ConfigurationManager.ConnectionStrings["DefaultConnection"].ToString());
SqlCommand dCmd = new SqlCommand();
{
conn.Open();
dCmd.CommandText = "Reviewer_Delete";
dCmd.CommandType = CommandType.StoredProcedure;
dCmd.Parameters.Add("@UserId", SqlDbType.NVarChar).Value = UserId;
dCmd.Connection = conn;
dCmd.ExecuteNonQuery();
// Refresh the data
BindDropDownList1();
dCmd.Dispose();
conn.Close();
conn.Dispose();
}
}
}
}
尝试使用GridView的OnRowCommand
事件来处理此问题。
在您的Gridview标记中 :
确保存在OnRowCommand="GridView1_RowCommand"
。
在后面的代码中 :
protected void GridView1_RowCommand(object sender, GridViewCommandEventArgs e)
{ /* Set a breakpoint here and make sure:
A.) You are hitting this method
B.) Get value of e.CommandName */
if (e.CommandName == "EditRecord")
{
// Run your edit/update logic here if needed
}
if (e.CommandName == "DeleteRecord")
{
// Delete the record here
string UserId = GridView1.DataKeys[e.RowIndex].Value.ToString();
SqlConnection conn = new SqlConnection(ConfigurationManager.ConnectionStrings["DefaultConnection"].ToString());
SqlCommand dCmd = new SqlCommand();
{
conn.Open();
dCmd.CommandText = "Reviewer_Delete";
dCmd.CommandType = CommandType.StoredProcedure;
dCmd.Parameters.Add("@UserId", SqlDbType.NVarChar).Value = UserId;
dCmd.Connection = conn;
dCmd.ExecuteNonQuery();
// Refresh the data
BindDropDownList1();
dCmd.Dispose();
conn.Close();
conn.Dispose();
}
}
最终这是一件非常简单的事情。 在aspx页面上,我将OnRowDeleting和CommandName元素都设置为相同的“ DeleteRecord”值。
将CommandName值更改为“ Delete”可以评估代码并成功调用存储过程。
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