Question

我有一个带有操作按钮的数据绑定网格视图，用于更新和删除用户购物车中的项目。网格视图在后面的代码中使用“SelectMethod”来生成数据。我遇到的问题是，每次在网格视图中编辑某些数据时，数据都会成功保留，但在页面完成加载之前会引发错误。

以下是例外情况：

System.InvalidOperationException ：

找不到名为''的公共方法，或者在'ASP.posworx_cart_aspx'类型上有多个具有相同名称的方法。

更令人困惑的是（''）是一个空字符串，我检查了我的代码，我甚至没有任何带有空字符串值的属性，除了对于项目模板的标题，我认为这甚至不重要。

这是堆栈跟踪：

[InvalidOperationException：找不到名为''的公共方法，或者在'ASP.posworx_cart_aspx'类型上有多个具有相同名称的方法。 System.Web.UI.WebControls.ModelDataSourceView.FindMethod（String methodName）+2464454 System.Web.UI.WebControls.ModelDataSourceView.RequireAsyncModelBinding（String methodName，ModelDataSourceMethod＆amp; method）+67 System.Web.UI.WebControls.ModelDataSourceView.Update（IDictionary键，IDictionary值，IDictionary oldValues，DataSourceViewOperationCallback回调）+97 System.Web.UI.WebControls.GridView.HandleUpdate（GridViewRow row，Int32 rowIndex，Boolean causeValidation）+1210 System.Web.UI.WebControls.GridView.HandleEvent（EventArgs e，Boolean causeValidation，String validationGroup）+877 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.LinkButton.OnCommand（CommandEventArgs e）+121 System.Web.UI.WebControls.LinkButton.RaisePostBackEvent（String eventArgument）+161 System.Web.UI.WebControls.LinkButton.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）+9754214 System.Web.UI.Page.ProcessRequestMain（Boolean includeStagesBeforeAsyncPoint，Boolean includeStagesAfterAsyncPoint）+3562

我的网格视图的标记代码：

<div class="table-responsive unbordered">
  <asp:GridView ID="shoppingCartGridView" runat="server" DataKeyNames="ItemDetailId" SelectMethod="GetShoppingCartItems" AutoGenerateColumns="false" BorderColor="Transparent" BackColor="White" ForeColor="Black" CssClass="table table-hover table-condensed"
    OnRowUpdating="shoppingCartGridView_RowUpdating" OnRowDeleting="shoppingCartGridView_RowDeleting" ItemType="OnlineShoppingApplication.BusinessEntities.ShoppingCart.ShoppingCartItem">
    <SelectedRowStyle BackColor="#CC3333" ForeColor="White"></SelectedRowStyle>
    <SortedAscendingCellStyle BackColor="#FFF"></SortedAscendingCellStyle>
    <SortedAscendingHeaderStyle BackColor="#333333"></SortedAscendingHeaderStyle>
    <SortedDescendingCellStyle BackColor="#FFF"></SortedDescendingCellStyle>
    <SortedDescendingHeaderStyle BackColor="#333333"></SortedDescendingHeaderStyle>

    <Columns>
      <asp:TemplateField HeaderText="Product" HeaderStyle-Width="50%">
        <ItemTemplate>
          <div class="row">
            <div class="col-sm-2 hidden-xs"><img class="img-responsive" src="../Images/product-image holder.gif" alt="<%#:Item.ItemDescription%>"></div>
            <div class="col-sm-10">
              <h4 class="bold-text nomargin">
                <%#:Item.ItemDescription %>
              </h4>
              <p data-th="Product">
                <%#:Item.ItemDescription %>
              </p>
            </div>
          </div>
        </ItemTemplate>
      </asp:TemplateField>
      <asp:BoundField DataField="ItemDetailId" HeaderText="Id" SortExpression="ItemDetailId" Visible="false" />
      <%--<asp:TemplateField HeaderText="Name">
                <ItemTemplate>
               <a class="btn-link bold-text" href="<%#: GetRouteUrl("ProductByIdRoute", new {productId = Item.ItemId,productDetailId = Item.ItemDetailId})%>">
        <%#:Item.ItemDescription%>
          </a>
          </ItemTemplate>
          </asp:TemplateField>--%>
          <asp:BoundField DataField="ItemPrice" ItemStyle-CssClass="btn-link item-vertical-align" HeaderText="Price" HeaderStyle-Width="10%" DataFormatString="{0:c}" />
          <asp:TemplateField HeaderText="Quantity" HeaderStyle-Width="8%">
            <ItemTemplate>
              <asp:TextBox ID="quantityTextBox" runat="server" CssClass="form-control text-center" Text="<%#:Item.Quantity %>" TextMode="Number"></asp:TextBox>
            </ItemTemplate>
          </asp:TemplateField>
          <asp:TemplateField HeaderText="Subtotal" HeaderStyle-Width="22%" HeaderStyle-CssClass="text-center" ItemStyle-CssClass="btn-link text-center">
            <ItemTemplate>
              <%#:$"{(Convert.ToDouble(Item.Quantity)) * (Convert.ToDouble(Item.ItemPrice)):c}"%>
            </ItemTemplate>
          </asp:TemplateField>
          <asp:TemplateField HeaderText="" HeaderStyle-Width="10%">
            <ItemTemplate>
              <asp:LinkButton ID="updateCartItemButton" runat="server" CssClass="btn btn-info btn-sm" Text='<i class="fa fa-refresh"></i>' alt="Update item" CommandName="Update">
              </asp:LinkButton>

              <asp:LinkButton ID="deleteCartItemButton" runat="server" CssClass="btn btn-danger btn-sm" Text='<i class="fa fa-trash-o"></i>' alt="Delete item" CommandName="Delete">
              </asp:LinkButton>
            </ItemTemplate>
          </asp:TemplateField>
    </Columns>

    <EmptyDataTemplate>
      <div class="row alert alert-warning alert-dismissable fade in" style="margin-bottom:0px">
        There are no items in your shopping cart
      </div>
    </EmptyDataTemplate>

    <EmptyDataTemplate>
      <div class="row alert alert-warning alert-dismissable fade in" style="margin-bottom:0px">
        There are no items in your shopping cart
      </div>
    </EmptyDataTemplate>
  </asp:GridView>
</div>
</div>

选择网格视图的方法：

public IQueryable<BusinessEntities.ShoppingCart.ShoppingCartItem> GetShoppingCartItems()
{
    IQueryable<BusinessEntities.ShoppingCart.ShoppingCartItem> shoppingCartItems = _cartService.GetCartItems(SiteMaster.Customer.CustomerGuid).AsQueryable();
    if (shoppingCartItems != null)
    {
        CreateCartSummary();    
    }
    return shoppingCartItems;
}

最后

shoppingCartGridView_RowUpdating 事件方法：

protected void shoppingCartGridView_RowUpdating(object sender, GridViewUpdateEventArgs e)
{
    try
    {
        int prouductDetailId = (int)shoppingCartGridView.DataKeys[e.RowIndex].Value;
        TextBox quantityTextBox = (TextBox)shoppingCartGridView.Rows[e.RowIndex].FindControl("quantityTextBox");
        int newQuantity = int.Parse(quantityTextBox.Text);
        UpdateCartItem(prouductDetailId, newQuantity);
        DisplayMessage("Your cart has been updated successfully", Bootstrap.MessageType.Success);
        shoppingCartGridView.DataBind();
    }
    catch (Exception ex)
    {
        ExceptionUtility.LogException(ex, $"{this}");
    }
}

和

shoppingCartGridView_RowDeleting 事件方法：

protected void shoppingCartGridView_RowDeleting(object sender, GridViewDeleteEventArgs e)
{
    try
    {
        int productDetailId = (int)shoppingCartGridView.DataKeys[e.RowIndex].Value;
        RemoveCartItem(productDetailId);
        DisplayMessage("The item has been deleted from your cart", Bootstrap.MessageType.Success);
        shoppingCartGridView.DataBind();
    }
    catch(Exception ex)
    {
        ExceptionUtility.LogException(ex, $"{this}");
        DisplayMessage(@"An error occured while deleting the item from the cart please try again later", Bootstrap.MessageType.Danger);
    }
}

先谢谢你们，我非常感谢你的帮助对此，因为我真的不知道该怎么做。

Answer 1

在对ModelDataSourceView类进行一些研究后，我发现该类的属性名为UpdateMethod，DeleteMethod，InsertMethod（基本属性为指定所有CRUD操作的名称）。

然后我认为在更新行时不会触发OnRowUpdating和OnRowDeleting事件，为什么不在GridView中添加UpdateMethod属性（该属性的值是负责执行更新操作的方法的名称）？毕竟，已经存在SelectMethod属性，因此让UpdateMethod和DeleteMethod属性与OnRowUpdating和{OnRowDeleting相比更有意义。 1}}被解雇的事件。

Aaaaand Walaaa !!!!!它工作得很好。

所以我的网格视图现在看起来像这样（我完成的所有工作都删除了OnRowUpdating属性并添加了UpdateMethod属性，当然，我将OnRowDeleting替换为DeleteMethod }）：

<asp:GridView
            ID="ShoppingCartGridView"
            runat="server"
            DataKeyNames="ItemDetailId"
            SelectMethod="GetShoppingCartItems"
            UpdateMethod="ShoppingCartGridView_UpdateItem"
            DeleteMethod="ShoppingCartGridView_DeleteItem"
            AutoGenerateColumns="false"
            BorderColor="Transparent"
            BackColor="White"
            ForeColor="Black"
            CssClass="table table-hover table-condensed"
            OnDataBound="ShoppingCartGridView_DataBound"
            ItemType="OnlineShoppingApplication.BusinessEntities.ShoppingCart.ShoppingCartItem">
            <SelectedRowStyle BackColor="#CC3333" ForeColor="White"></SelectedRowStyle>
            <SortedAscendingCellStyle BackColor="#FFF"></SortedAscendingCellStyle>
            <SortedAscendingHeaderStyle BackColor="#333333"></SortedAscendingHeaderStyle>
            <SortedDescendingCellStyle BackColor="#FFF"></SortedDescendingCellStyle>
            <SortedDescendingHeaderStyle BackColor="#333333"></SortedDescendingHeaderStyle>

            <Columns>
                <asp:TemplateField HeaderText="Product" HeaderStyle-Width="50%">
                    <ItemTemplate>
                        <div class="row">
                            <div class="col-sm-2 hidden-sm hidden-xs">
                                <img class="img-responsive" src="../Images/product-image holder.gif" alt="<%#:Item.ItemDescription%>"></div>
                            <div class="col-sm-10">
                                <h4 class="bold-text nomargin"><%#:Item.ItemDescription %></h4>
                                <p data-th="Product">
                                    <a
                                        href="<%#:GetRouteUrl("ProductByIdRoute", new {productId = Item.ItemId,productDetailId = Item.ItemDetailId})%>"
                                        class="btn-link"><%#:$"{Item.SizeCurve} {Item.Colour} {Item.ItemDescription}"%>
                                    </a>
                                </p>
                            </div>
                        </div>
                    </ItemTemplate>
                </asp:TemplateField>
                <asp:BoundField DataField="ItemDetailId" HeaderText="Id" SortExpression="ItemDetailId" Visible="false" />
               <asp:BoundField DataField="ItemPrice"  ItemStyle-CssClass="currency item-vertical-align" HeaderText="Price" HeaderStyle-Width="10%" DataFormatString="{0:F2}"/>
                <asp:TemplateField HeaderText="Quantity" HeaderStyle-Width="8%">
                    <ItemTemplate>
                        <asp:TextBox ID="quantityTextBox" runat="server" CssClass="form-control text-center" Text="<%#:Convert.ToInt32(Item.Quantity) %>" TextMode="Number"></asp:TextBox>
                    </ItemTemplate>
                </asp:TemplateField>
                <asp:TemplateField HeaderText="Subtotal" HeaderStyle-Width="22%" HeaderStyle-CssClass="text-center" ItemStyle-CssClass="text-center">
                    <ItemTemplate>
                        <%#:$"{Convert.ToInt32((Convert.ToDouble(Item.Quantity)) * (Convert.ToDouble(Item.ItemPrice)))}"%>
                    </ItemTemplate>
                </asp:TemplateField>
                <asp:TemplateField HeaderText=" " HeaderStyle-Width="10%" ItemStyle-CssClass="action">
                    <ItemTemplate>
                        <asp:LinkButton
                            ID="updateCartItemButton"
                            runat="server"
                            CssClass="btn btn-info btn-sm"
                            Text='<i class="fa fa-refresh"></i>'
                            alt="Update item"
                            CommandName="Update">
               </asp:LinkButton>

                        <asp:LinkButton
                            ID="deleteCartItemButton"
                            runat="server"
                            CssClass="btn btn-danger btn-sm"
                            Text='<i class="fa fa-trash-o"></i>'
                            alt="Delete item"
                            CommandName="Delete">
                        </asp:LinkButton>
                    </ItemTemplate>
                </asp:TemplateField>
            </Columns>

            <EmptyDataTemplate>
                <div class="row alert alert-warning alert-dismissable fade in" style="margin-bottom: 0px">
                    There are no items in your shopping cart
                </div>
            </EmptyDataTemplate>

            <EmptyDataTemplate>
                <div class="row alert alert-warning alert-dismissable fade in" style="margin-bottom: 0px">
                    There are no items in your shopping cart
                </div>
            </EmptyDataTemplate>
        </asp:GridView>

这是我在网格视图中引用的新的，但没有那么不同的UpdateMethod：

public void shoppingCartGridView_UpdateItem(int ItemDetailId)
   {
        try
        {
            int rowIndex = GetRowIndexByItemDetailId(ItemDetailId);
            TextBox quantityTextBox = (TextBox)ShoppingCartGridView.Rows[rowIndex].FindControl("quantityTextBox");
            int newQuantity = int.Parse(quantityTextBox.Text);
            UpdateCartItem(ItemDetailId, newQuantity);
            DisplayMessage("Your cart has been updated successfully", Bootstrap.MessageType.Success);
            ShoppingCartGridView.DataBind();
        }
        catch (Exception ex)
        {
            ExceptionUtility.LogException(ex, $"{this}");
            DisplayMessage(@"An error occured while updating your cart item, 
                             please try again in a moment", Bootstrap.MessageType.Danger);
        }
    }

找不到名为''的公共方法

1 个答案: