WPF Application using a global variable

问题

I created a WPF application in c# with 3 different windows, Home.xaml, Name.xaml, Config.xaml. I want to declare a variable in Home.xaml.cs that I can use in both the other forms. I tried doing public string wt = ""; but that didn't work.

How can I make it usable by all three forms?

回答1:

The proper way, especially if you ever want to move to XBAPP, is to store it in

Application.Current.Properties

which is a Dictionary object.

回答2:

To avoid having to pass around values between windows and usercontrols, or creating a static class to duplicate existing functionality within WPF, you could use:

setting: App.Current.Properties["NameOfProperty"] = 5;
getting: string myProperty = App.Current.Properties["NameOfProperty"];

This was mentioned above, but the syntax was a little off.

This provides global variables within your application, accessible from any code running within it.

回答3:

You can use a static property:

public static class ConfigClass()
{
    public static int MyProperty { get; set; }
}

Edit:

The idea here is create a class that you holds all "common data", typically configurations. Of course, you can use any class but suggest you to use a static class. You can access this property like this:

Console.Write(ConfigClass.MyProperty)

回答4:

There are two different things you can do here (among others; these are just the two that come to mind first).

You could make the variable static on Home.xaml.cs

public static string Foo = "";
You could just pass in the variable to all three forms.

I would go with #2, myself, and if necessary create a separate class that contains the data I need. Then each class would have access to the data.

回答5:

App.xaml:

<Application x:Class="WpfTutorialSamples.App"
         xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
         xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
         xmlns:sys="clr-namespace:System;assembly=mscorlib"
         StartupUri="WPF application/ResourcesFromCodeBehindSample.xaml">
<Application.Resources>
    <sys:String x:Key="strApp">Hello, Application world!</sys:String>
</Application.Resources>

code behind

Application.Current.FindResource("strApp").ToString()

来源：https://stackoverflow.com/questions/1161459/wpf-application-using-a-global-variable

标签

wpf

global-variables