【发布时间】：2017-03-07 07:55:54
【问题描述】：
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，每次我在网格视图中编辑一些数据时，数据都会成功持久化，但是在页面完成加载之前就会抛出错误。
以下是异常详情：
System.InvalidOperationException：
找不到名为“”的公共方法，或者“ASP.posworx_cart_aspx”类型上有多个同名方法。
更令人困惑的是 (' ') 是一个空字符串，我检查了我的代码，我什至没有任何具有空字符串值的属性，除了 对于项目模板的标题，我认为这并不重要。
这是堆栈跟踪：
[InvalidOperationException：找不到名为“”的公共方法，或者在“ASP.posworx_cart_aspx”类型上有多个同名的方法。] System.Web.UI.WebControls.ModelDataSourceView.FindMethod(String methodName) +2464454 System.Web.UI.WebControls.ModelDataSourceView.RequireAsyncModelBinding(String methodName, ModelDataSourceMethod& 方法) +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（对象源，EventArgs e）+89 System.Web.UI.Control.RaiseBubbleEvent（对象源，EventArgs args）+37 System.Web.UI.WebControls.GridViewRow.OnBubbleEvent（对象源，EventArgs e）+90 System.Web.UI.Control.RaiseBubbleEvent（对象源，EventArgs args）+37 System.Web.UI.WebControls.LinkButton.OnCommand(CommandEventArgs e) +121 System.Web.UI.WebControls.LinkButton.RaisePostBackEvent（字符串 eventArgument）+161 System.Web.UI.WebControls.LinkButton.System.Web.UI.IPostBackEventHandler.RaisePostBackEvent（字符串 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;
}
终于来了
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}");
}
}
还有
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);
}
}
在此先感谢各位，我将非常感谢您的帮助 关于这个，因为我真的不知道该怎么办。
【问题讨论】：
-
我试过它不起作用，我仍然得到同样的错误，但感谢您的输入。