WPF 将文本框绑定到字典条目
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WPF binding textbox to dictionary entry
提问by user2377283
i try to bind a wpf textbox to a dictionary placed in a viewmodel. The viewmodel is used as datacontext for the view. I found a lot of examples and it sounds simple, but it will not work for me.
我尝试将 wpf 文本框绑定到放置在视图模型中的字典。视图模型用作视图的数据上下文。我找到了很多例子，听起来很简单，但它对我不起作用。
View:
看法：
TextBox x:Name="txbTest" Grid.Row="10" Grid.Column="2" Text="{Binding MyDict[First]}"
TextBox x:Name="txbTest" Grid.Row="10" Grid.Column="2" Text="{Binding MyDict[First]}"
ViewModel:
视图模型：
public Dictionary<string, string> MyDict = new Dictionary<string, string>
{
{"First", "Test1"},
{"Second", "Test2"}
};
I try all variants i found
我尝试了我发现的所有变体
Text="{Binding MyDict[First]}"
Text="{Binding Path=MyDict[First]}"
Text="{Binding MyDict[First].Text}"
Text="{Binding MyDict[First].Value}"
But nothing works, textbox is empty. Any idea?
但没有任何效果，文本框是空的。任何的想法？
回答by Anand Murali
There is a Binding error in your code because MyDictis not a property. You have to bind to a Propertyand not to a Field
您的代码中存在绑定错误，因为MyDict它不是属性。你必须绑定到 aProperty而不是 aField
System.Windows.Data Error: 40 : BindingExpression path error: 'MyDict' property not found on 'object' ''MainWindow' (Name='')'. BindingExpression:Path=MyDict[First]; DataItem='MainWindow' (Name=''); target element is 'TextBox' (Name='textBox1'); target property is 'Text' (type 'String')
Change the MyDict Fieldto a Propertylike shown below
改变MyDictField到Property像下面所示
private Dictionary<string, string> _MyDict;
public Dictionary<string, string> MyDict
{
get { return _MyDict; }
set { _MyDict = value; }
}
In the constructor of your ViewModelinitialize MyDict.
在ViewModel初始化 MyDict的构造函数中。
MyDict = new Dictionary<string, string>
{
{"First", "Test1"},
{"Second", "Test2"}
};
The following two variants will not work as MyDict["key"] returns a stringand stringdoes not have a Textor Valueproperty. The other two variants should work.
以下两个变体将不起作用，因为 MyDict["key"] 返回 astring并且string没有 a TextorValue属性。其他两个变体应该可以工作。
Text="{Binding MyDict[First].Text}"
Text="{Binding MyDict[First].Value}"
The following bindings will work
以下绑定将起作用
Text="{Binding MyDict[First]}"
Text="{Binding Path=MyDict[First]}"
