C# 绑定源是带有属性路径的字符串
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Binding source is string with path to property
提问by Nick
I am unsure if this is even possible, but I thought I would ask. First off, for my purposes, I require this to work in the C# portion and not the XAML part. This is what I have and it works:
我不确定这是否可能，但我想我会问。首先，出于我的目的，我需要它在 C# 部分而不是 XAML 部分中工作。这就是我所拥有的并且它有效：
public partial class MyClass1 : Window
{
public MyClass2 MyClass2Object { get; set; }
public MyClass1()
{
InitializeComponent();
MyClass2Object = new MyClass2();
Binding binding = new Binding();
binding.Source = MyClass2Object;
binding.Path = new PropertyPath("StringVar");
TextBoxFromXaml.SetBinding(TextBox.TextProperty, binding);
}
}
public class MyClass2
{
public string StringVar { get; set; }
public MyClass2()
{
StringVar = "My String Here";
}
}
And this will bind to my StringVar property exactly how I would like it to. However, my question comes with what if I have the literal string "MyClass2Object.StringVar" when setting the binding source. I realize I can use the split function to separate "MyClass2Object" and "StringVar" from the longer string. I can then just replace the new PropertyPath line with the the second result from the split. However, how would I replace the binding.Source line according to the first result from the split. If this is possible, I would be able to pass a string like "MyClass2Object.StringVar" and have the TextBox's Text property bind to that property or if I pass a string like "AnotherClassObject.StringProperty" and have the TextBox's Text property bind to the StringProperty property of the object instantiated in the variable with name AnotherClassObject. I hope I am making sense.
这将按照我希望的方式绑定到我的 StringVar 属性。但是，我的问题是如果我在设置绑定源时有文字字符串“MyClass2Object.StringVar”怎么办。我意识到我可以使用 split 函数将“MyClass2Object”和“StringVar”与较长的字符串分开。然后我可以用拆分的第二个结果替换新的 PropertyPath 行。但是，我将如何根据拆分的第一个结果替换 binding.Source 行。如果这是可能的，我将能够传递像“MyClass2Object.StringVar”这样的字符串并将 TextBox 的 Text 属性绑定到该属性，或者如果我传递一个像“AnotherClassObject.StringProperty”这样的字符串并具有 TextBox' ■ Text 属性绑定到在名为AnotherClassObject 的变量中实例化的对象的StringProperty 属性。我希望我说得有道理。
采纳答案by Todd White
It sounds like you want the PropertyPath to be "Property.Property" which will work, but for the binding to work it needs a source object for the first Property. The two options that I'm aware of are DataContextor a Source.
听起来您希望 PropertyPath 为“Property.Property”，这将起作用，但是要使绑定起作用，它需要第一个 Property 的源对象。我知道的两个选项是DataContext或Source。
With your sample code the other alternative is:
使用您的示例代码，另一种选择是：
public partial class Window1 : Window
{
public MyClass2 MyClass2Object { get; set; }
public Window1()
{
// use data context instead of source
DataContext = this;
InitializeComponent();
MyClass2Object = new MyClass2();
Binding binding = new Binding();
binding.Path = new PropertyPath("MyClass2Object.StringVar");
TextBoxFromXaml.SetBinding(TextBox.TextProperty, binding);
}
}
public class MyClass2
{
public string StringVar { get; set; }
public MyClass2()
{
StringVar = "My String Here";
}
}
