模型綁定Web窗體TryUpdateModel不工作

Question

我在網絡表格簡單FormView控件和簡單的modelbinding：

<asp:FormView ID="frm" ItemType="SabaDoor2.Models.Content" SelectMethod="frm_GetItem" UpdateMethod="frm_UpdateItem" DataKeyNames="Id" runat="server"> 
    <ItemTemplate> 
     <fieldset> 
      <legend> 
       <asp:Label ID="lblName" Text='<%# Item.Name %>' runat="server"></asp:Label> 
      </legend> 
      <p> 
       <label>descripion :</label> 
       <asp:Label ID="lblDescription" Text='<%# Item.Description %>' runat="server"></asp:Label> 
      </p> 
      <p> 
       <asp:Button ID="btnEdit" Text="edit" CommandName="Edit" runat="server" /> 
      </p> 
     </fieldset> 
    </ItemTemplate> 
    <EditItemTemplate> 
     <fieldset> 
      <legend> 
       <asp:Label ID="lblName" Text='<%# Item.Name %>' runat="server"></asp:Label> 
      </legend> 
      <p> 
       <label>description :</label> 
       <asp:TextBox ID="txt" Text='<%# Item.Description %>' runat="server" ></asp:TextBox> 
      </p> 
      <p> 
       <asp:Button CommandName="Update" ValidationGroup="mainPropertyGroup" runat="server" ID="btnUpdate" Text="update" /> 
       <asp:Button CommandName="Cancel" ValidationGroup="mainPropertyGroup" runat="server" ID="btnCancel" Text="cancel" /> 
      </p> 
     </fieldset> 
     <br /> 
    </EditItemTemplate> 
</asp:FormView> 

，並在代碼：

Models.Model1Container _db = new Models.Model1Container(); 

    protected void Page_Load(object sender, EventArgs e) 
    { 
     bindEvents(); 
     lblResult.ForeColor = System.Drawing.Color.Green; 
     lblResult.Text = ""; 
     if (!IsPostBack) 
     { 
     } 
     else 
     { 

     } 

    } 

    private void bindEvents() 
    { 
     frm.ItemUpdated += frm_ItemUpdated; 

    } 

    void frm_ItemUpdated(object sender, FormViewUpdatedEventArgs e) 
    { 
     if (e.Exception == null) 
     { 
      lblResult.ForeColor = System.Drawing.Color.Green; 
      lblResult.Text = "done!"; 
     } 
     else 
     { 
      lblResult.ForeColor = System.Drawing.Color.Red; 
      lblResult.Text = "error:" + e.Exception.Message; 
      e.KeepInEditMode = true; 
     } 


    } 


    public SabaDoor2.Models.Content frm_GetItem([System.Web.ModelBinding.QueryString("Id")]int? Id) 
    { 
     return _db.Contents.Find(Id); 
    } 

    // The id parameter name should match the DataKeyNames value set on the control 
    public void frm_UpdateItem(int Id) 
    { 
     SabaDoor2.Models.Content item = null; 
     item = _db.Contents.Find(Id); 
     if (item == null) 
     { 
      // The item wasn't found 
      ModelState.AddModelError("", String.Format("Item with id {0} was not found", Id)); 
      return; 
     } 
     var result = TryUpdateModel(item); 


     if (ModelState.IsValid) 
     { 
      _db.SaveChanges(); 

     } 
    } 


    public override void Dispose() 
    { 
     _db.Dispose(); 
     base.Dispose(); 
    } 

tryUpdateModel回報真正但我的模型（描述場）不更新 :(

Answer 1

我找出邏輯錯誤： 我必須初始化BindItem.Name的財產instd item.Name

Text='<%# BindItem.Description %>'