使用Unity 2.0時ASP.NET 4.0 GridView OnRowEditing事件不會觸發http模塊

Question

我有一個使用母版頁的ASP.NET web表單站點。它使用Unity作爲我的IoC容器。我創建了一個HTTP模塊來使用我在網上找到的幾個教程構建容器。我需要依賴注入來爲用戶控件工作，並且我能夠實現這個功能的唯一方法就是掛入Pages PreInit事件中，如下面的代碼所示。

public class UnityHttpModule : IHttpModule 
{ 
    public void Init(HttpApplication context) 
    { 
     context.PreRequestHandlerExecute += OnPreRequestHandlerExecute; 
    } 

    public void Dispose() { } 

    private void OnPreRequestHandlerExecute(object sender, EventArgs e) 
    { 
     IHttpHandler currentHandler = HttpContext.Current.Handler; 
     HttpContext.Current.Application.GetContainer().BuildUp(
          currentHandler.GetType(), currentHandler); 

     // User Controls are ready to be built up after page initialization is complete 
     var currentPage = HttpContext.Current.Handler as Page; 
     if (currentPage != null) 
     { 
      currentPage.PreInit += Page_PreInit; 
     } 
    } 

    // Build up each control in the page's control tree 
    private void Page_PreInit(object sender, EventArgs e) 
    { 
     var currentPage = (Page)sender; 

     BuildUp(currentPage); 

     BuildUpMaster(currentPage.Master); 

     BuildUpControls(currentPage.Controls); 
    } 


    private void BuildUp(object o) 
    { 
     HttpContext.Current.Application.GetContainer().BuildUp(o.GetType(), o); 
    } 

    private void BuildUpControls(ControlCollection controls) 
    { 
     foreach (Control c in controls) 
     { 
      if (c is UserControl) 
       BuildUp(c); 

      BuildUpControls(c.Controls); 
     } 
    } 

    private void BuildUpMaster(MasterPage page) 
    { 
     if (page != null) 
     { 
      BuildUp(page); 
      BuildUpMaster(page.Master); 
     } 
    } 

} 

我的頁面和控件都繼承了處理依​​賴注入的基本實現，例如，

public class MyBaseUserControl : UserControl 
{ 
    [Dependency] 
    public IMyServiceProvider MyService { get; set; } 
} 

public class MyPage : Page 
{ 
    [Dependency] 
    public IMyServiceProvider MyService { get; set; } 
} 

我的依賴注入正在按計劃進行，但是當我用GridView的在我的網頁上OnRowEditing等命令不火的GridView控件。它好像事件沒有連接起來。我已經在HTML中設置了以下事件。

<asp:GridView ID="gvComplaintCategory" runat="server" AutoGenerateColumns="False" DataKeyNames="ComplaintCategoryID" BackColor="#FFFFFF" GridLines="None" 
     CellPadding="2" CellSpacing="2" AllowPaging="True" PageSize="8" ShowFooter="true" 
     OnRowCommand="gvComplaintCategory_OnRowCommand" 
     OnRowEditing="gvComplaintCategory_OnRowEditing" 
     OnRowCancelingEdit="gvComplaintCategory_OnRowCancelingEdit"> 

       <asp:TemplateField> 
        <HeaderTemplate>Complaint Category Name</HeaderTemplate> 
        <EditItemTemplate> 
         <asp:TextBox ID="txtComplaintCategoryEdit" runat="server" CssClass="textbox" Text='<%# DataBinder.Eval(Container.DataItem, "ComplaintCategoryName") %>'></asp:TextBox> 
         &nbsp; 
         <asp:RequiredFieldValidator ID="rfvComplaintCategoryEdit" runat="server" ControlToValidate="txtComplaintCategory" Text="*" CssClass="RequiredFieldValidator" ValidationGroup="dgComplaintCategory"></asp:RequiredFieldValidator> 
        </EditItemTemplate> 
        <ItemTemplate> 
         <asp:Label ID="lblComplaintCategory" runat="server" CssClass="label" Text='<%# DataBinder.Eval(Container.DataItem, "ComplaintCategoryName") %>'></asp:Label> 
        </ItemTemplate> 
        <FooterTemplate> 
         <asp:TextBox ID="txtComplaintCategoryNew" runat="server" CssClass="textbox"></asp:TextBox> 
         &nbsp; 
         <asp:RequiredFieldValidator ID="rfvComplaintCategoryNew" runat="server" ControlToValidate="txtComplaintCategoryNew" Text="*" CssClass="RequiredFieldValidator" ValidationGroup="dgComplaintCategory"></asp:RequiredFieldValidator> 
        </FooterTemplate> 
       </asp:TemplateField> 
       <asp:TemplateField> 
        <EditItemTemplate> 
         <asp:Button ID="btnComplaintCategoryUpdate" runat="server" CssClass="button" CommandName="Update" Text="Update" CausesValidation="true" ValidationGroup="dgComplaintCategory"/> 
         &nbsp; 
         <asp:Button ID="btnComplaintCategoryDelete" runat="server" CssClass="button" CommandName="Delete" Text="Delete" CausesValidation="false" ValidationGroup="dgComplaintCategory"/> 
         &nbsp; 
         <asp:Button ID="btnComplaintCategoryCancel" runat="server" CssClass="button" CommandName="Cancel" Text="Cancel" CausesValidation="false" ValidationGroup="dgComplaintCategory"/> 
        </EditItemTemplate> 
        <ItemTemplate> 
         <asp:Button ID="btnComplaintCategoryEdit" runat="server" CssClass="button" CommandName="Edit" Text="Edit" CausesValidation="false" ValidationGroup="dgComplaintCategory"/> 
        </ItemTemplate> 
        <FooterTemplate> 
         <asp:Button ID="btnComplaintCategoryAdd" runat="server" CssClass="button" CommandName="Add" Text="Add" CausesValidation="true" ValidationGroup="dgComplaintCategory"/> 
        </FooterTemplate> 
       </asp:TemplateField> 
      </Columns> 
    </asp:GridView> 

我還在頁面和母版頁上將autoeventwireup設置爲true。任何人都可以闡明爲什麼事件不會解僱？我的Unity http模塊是否通過刪除事件接線而導致這種情況發生？在沒有IoC參與的基本示例中，我可以使這個工作沒有問題。

任何幫助將不勝感激。

感謝

馬特

Answer 1

的原因是要修改的控制他們加載其之前的ViewState。

移動堆積在預緊應該工作，因爲ViewState的is loaded before the PreLoad event

private void OnPreRequestHandlerExecute(object sender, EventArgs e) 
{ 
    IHttpHandler currentHandler = HttpContext.Current.Handler; 
    HttpContext.Current.Application.GetContainer().BuildUp(
         currentHandler.GetType(), currentHandler); 

    // User Controls are ready to be built up after page initialization is complete 
    var currentPage = HttpContext.Current.Handler as Page; 
    if (currentPage != null) 
    { 
     currentPage.PreInit += Page_PreInit; 
     currentPage.PreLoad += Page_PreLoad; 
    } 
} 

// Build up each control in the page's control tree 
private void Page_PreInit(object sender, EventArgs e) 
{ 
    var currentPage = (Page)sender; 

    BuildUp(currentPage); 

    BuildUpMaster(currentPage.Master); 
} 

private void Page_PreLoad(object sender, EventArgs e) 
{ 
    var currentPage = (Page)sender; 

    BuildUpControls(currentPage.Controls); 
}