空值转化为bool后以空显示在GridView中

Question

<asp:TemplateField HeaderText="是否家庭流入">
                                                          <EditItemTemplate>
                                                              <asp:TextBox ID="TextBox1" runat="server" Text='<%# Bind("IsFFlow") %>'></asp:TextBox>
                                                          </EditItemTemplate>
                                                          <ItemTemplate>
                                                              <asp:Label ID="Label1" runat="server" Text='<%#Convert.ToBoolean(Convert.IsDBNull(DataBinder.Eval(Container.DataItem,"IsFFlow"))?false:true) ?"是":"否" %>'></asp:Label>
                                                          </ItemTemplate>
                                                      </asp:TemplateField>是否家庭流入有三个选项：--请选择--,是，否这个不是必填字段，我插入数据库中是采用了bool?可空类型插入进去的。但是如果客户他不填这个的话，做详细页面时我怎样已空显示在gridview中的呢？

Answer 1

Label1 的值在后台写个方法来处理
<asp:Label ID="Label1" runat="server" Text=' <%# GetText(Eval("IsFFlow").ToString())%>'> </asp:Label> GetText方法写在后台 根据IsFFlow的值返回相应的值