System.InvalidOperationException 执行 OnRowCommand 后未给出名称 (ASP.NET)

Question

因此，在我使用 GridView 上的 onRowCommand 从数据库中删除项目后，我得到了 System.InvalidOperationException，下面的错误。事情是它完美地工作，它删除了项目但是在 onRowCommand 中指定的方法完成后它给了我错误，这是没有意义的。已经看过 this and this

错误：未找到名称为“”的 public 方法，或者类型 'ASP.admin_overview_aspx'

中有多个同名方法

堆栈跟踪：

[InvalidOperationException: A public method with the name '' was either not found or there were multiple methods with the same name on the type 'ASP.admin_overview_aspx'.]
   System.Web.UI.WebControls.ModelDataSourceView.FindMethod(String methodName) +2439378
   System.Web.UI.WebControls.ModelDataSourceView.RequireAsyncModelBinding(String methodName, ModelDataSourceMethod& method) +67
   System.Web.UI.WebControls.ModelDataSourceView.Delete(IDictionary keys, IDictionary oldValues, DataSourceViewOperationCallback callback) +86
   System.Web.UI.WebControls.GridView.HandleDelete(GridViewRow row, Int32 rowIndex) +930
   System.Web.UI.WebControls.GridView.HandleEvent(EventArgs e, Boolean causesValidation, String validationGroup) +1183
   System.Web.UI.WebControls.GridView.OnBubbleEvent(Object source, EventArgs e) +89
   System.Web.UI.Control.RaiseBubbleEvent(Object source, EventArgs args) +37
   System.Web.UI.WebControls.GridViewRow.OnBubbleEvent(Object source, EventArgs e) +90
   System.Web.UI.Control.RaiseBubbleEvent(Object source, EventArgs args) +37
   System.Web.UI.WebControls.Button.OnCommand(CommandEventArgs e) +114
   System.Web.UI.WebControls.Button.RaisePostBackEvent(String eventArgument) +260
   System.Web.UI.WebControls.Button.System.Web.UI.IPostBackEventHandler.RaisePostBackEvent(String eventArgument) +12
   System.Web.UI.Page.RaisePostBackEvent(IPostBackEventHandler sourceControl, String eventArgument) +15
   System.Web.UI.Page.RaisePostBackEvent(NameValueCollection postData) +35
   System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +1639

这是网格视图：

<h4>General Policies  </h4>
        <asp:GridView runat="server" ID="GeneralGrid"
            ItemType="Source.GeneralPolicy" DataKeyNames="id"
            SelectMethod="GPolicyGrid_Get"
            AutoGenerateColumns="false" OnRowCommand="GeneralGrid_RowCommand">
            <Columns>
                <asp:DynamicField DataField="id" />
                <asp:DynamicField DataField="name" />
                <asp:DynamicField DataField="appliedGroup" />
                <asp:DynamicField DataField="author" />
                <asp:DynamicField DataField="createdOn" />
                <asp:DynamicField DataField="modifiedOn" />
                <asp:TemplateField>
                    <ItemTemplate>
                        <asp:Button ID="ButtonEdit" runat="server" CommandName="EDIT" CommandArgument="<%# ((GridViewRow) Container).RowIndex %>" Text="Edit" />
                        <asp:Button ID="ButtonDelete" runat="server" CommandName="DELETE" CommandArgument="<%# ((GridViewRow) Container).RowIndex %>" Text="Delete" />
                    </ItemTemplate>
                </asp:TemplateField>
            </Columns>
        </asp:GridView>

这是隐藏代码：

protected void passwordGrid_RowCommand(object sender, GridViewCommandEventArgs e)
    {

        GridView gv = (GridView)sender;
        int index = Convert.ToInt32(e.CommandArgument.ToString());
        int id = Convert.ToInt32(gv.DataKeys[index].Value);

        if (e.CommandName == "EDIT")
        {
            Response.Redirect("~/Admin,false);
        }
        else if (e.CommandName == "DELETE")
        {
            using (NubeSSPRContext db = new NubeSSPRContext())
            {

                var ppolicy = db.PasswordPolicies.Find(id);
                db.Entry(ppolicy).State = EntityState.Deleted;

                try
                {
                    db.SaveChanges();
                }
                catch (DbUpdateConcurrencyException)
                {
                    ModelState.AddModelError("",
                     String.Format("Item with id {0} no longer exists in the database.", id));
                }
            }

        }

知道来源吗？我有四个表，我可以使用不同的 onRowCommand 方法从中删除，并且所有这些表 return 删除后出现相同的错误。

提前致谢

Answer 1

好的，所以我找到了问题的根源。我会留下答案以防万一有人遇到同样的问题。这似乎是 OnRowCommand="GeneralGrid_RowCommand" 和 DELETE 命令的问题。所以我找到了另一种更简单的方法来执行编辑和删除命令。基本上像这样执行 updateMethod 和 deleteMethod 更容易：

 public void AnswerGrid_DeleteItem(int id)
    {
        using (NubeSSPRContext db = new NubeSSPRContext())
        {

            var policy = db.AnswerPolicies.Find(id);
            db.Entry(policy).State = EntityState.Deleted;

            try
            {
                db.SaveChanges();

            }
            catch (DbUpdateConcurrencyException)
            {
                ModelState.AddModelError("",
                     String.Format("Item with id {0} no longer exists in the database.", id));
            }
        }
    }

    // The id parameter name should match the DataKeyNames value set on the control
    public void GeneralGrid_UpdateItem(int id)
    {
        Response.Redirect("~/Admin/GeneralSettings?GeneralPolicyID=" + id.ToString(), false);
    }

然后使用 CommandName="Update"、"Delete" 更新网格的按钮。我没有找到错误的原因，但至少可以解决。

System.InvalidOperationException 执行 OnRowCommand 后未给出名称 (ASP.NET)

System.InvalidOperationException with no name given after executing an OnRowCommand (ASP.NET)

c#

asp.net

gridview

invalidoperationexception

visual-studio