Question

我有雇主名单，这些雇主绑定数据并填写特殊表格。当我进入表单时，我会清楚地显示每个文本框。我填写所有这些并保存新雇主列表。但是，如果我尝试添加新的雇主，我会在文本框中添加以前的文本。绑定到表单中文本框的变量都是null。有没有办法解决问题而不使用像这样的解决方案：Textbox.text = null;？我在我的应用程序中使用MVVM模式。我还使用catel片段来定义视图模型和属性。页面的ViewModel代码包含雇主属性：

public EmployerModifyViewModel(TransferParameter parameter, IEmployersListManage employersListManager)
{
    //in "parameter" I pass values fo Current employer (it can be empty 
    //if we need to add new object to list or it can be some employer from list) 
    _employersListManager = employersListManager;
    SaveEmployerCommand = new Command(OnSaveEmployerCommandExecute);
    CanselSavingCommand = new Command(OnCanselSavingCommandExecute);
    if (parameter.Value is EmployerClass)
    {
        CurrentEmployer = parameter.Value as EmployerClass;
    }
}

public EmployerClass CurrentEmployer
{
    get { return GetValue<EmployerClass>(CurrentEmployerProperty); }
    private set { SetValue(CurrentEmployerProperty, value); }
}

/// <summary>
/// Register the CurrentEmployerBase property so it is known in the class.
/// </summary>
public static readonly PropertyData CurrentEmployerProperty = RegisterProperty("CurrentEmployer", typeof(EmployerClass), new EmployerClass());

在xaml中有绑定属性的示例：

<ContentControl Content="{Binding CurrentEmployer, Mode=TwoWay}">
    <ContentCntrol.Recources>
        <DataTemplate DataType="{x:Type employer:EmployerClass}">
...
            <TextBox Grid.Column="1"
                     x:Name="EmpName"
                     Width="300"
                     Height="30"
                     FontSize="14"
                     Text="{Binding Name, Mode=TwoWay}" //Property "Name" of CurrentEmployer
                     HorizontalAlignment="Left"
                     Margin="20,20,0,0"/>

Answer 1

我认为您应该使用以下代码添加新员工。每次单击按钮时，文本框都会变空。

            txtbox_1.Text = String.Empty;
            txtbox_2.Text = String.Empty;
            .............

Answer 2

谢谢大家，问题解决了。我从xaml中删除了ContentControl和DataTemplate，我制作了像"{Binding CurrentEmployer.Name, Mode=TwoWay}"这样的绑定。

加载页面时，文本框不会自行清除

2 个答案: