c# - 语言更改后立即访问 CurrentInputLanguage 属性不会更新

Question

请查看下面的代码以更好地理解我的意思：

using System;
using System.Windows.Forms;

namespace CurrentInputLanguageTest
{
    static class Program
    {
        [STAThread]
        static void Main()
        {
            Console.WriteLine(InputLanguage.CurrentInputLanguage.LayoutName); // It's US
            Console.ReadLine(); // Changed my keyboard layout while typing something
            Console.WriteLine(InputLanguage.CurrentInputLanguage.LayoutName); // It's still US

            var form = new Form();
            var button = new Button();
            button.Click += CheckInputLanguage;
            form.Controls.Add(button);
            Application.Run(form);
        }

        static void CheckInputLanguage(object sender, EventArgs e)
        {
            // I have changed my input language while the form is opened and pressed the button.
            // It changes when called in this event handler.
            Console.WriteLine(InputLanguage.CurrentInputLanguage.LayoutName); 
        }
    }
}

问题：我的应用程序中有一些事件处理程序，当事件被触发时，我需要知道当前的输入语言是什么。我怎样才能做到这一点？

Answer 1

它总是返回 US 的原因是因为您在命令中并且仅针对该输入行是设置已更改。

如果用户在显示表单时更改输入语言，则正确返回当前语言。但您也可以通过另一个按钮以编程方式设置 is：

using System;
using System.Windows.Forms;

namespace CurrentInputLanguageTest
{
    static class Program
    {
        [STAThread]
        static void Main()
        {
            Console.WriteLine(InputLanguage.CurrentInputLanguage.LayoutName); // It's US
            Console.ReadLine(); // Changed my keyboard layout while typing something
            Console.WriteLine(Application.CurrentInputLanguage.LayoutName); // It's still US

            var form = new Form();
            var grid = new TableLayoutPanel();
            var button = new Button();
            var button2 = new Button();
            button2.Left = button.Right + 5;
            form.Refresh();
            button.Click += CheckInputLanguage;
            button2.Click += ChangeInputLanguage;
            form.Controls.Add(button);
            form.Controls.Add(button2);
            Application.Run(form);
        }

        private static void ChangeInputLanguage(object sender, EventArgs e)
        {
            InputLanguage.CurrentInputLanguage = InputLanguage.FromCulture(System.Globalization.CultureInfo.GetCultureInfo("en-US"));
        }

        static void CheckInputLanguage(object sender, EventArgs e)
        {
            // I have changed my input language while the form is opened and pressed the button.
            // It changes when called in this event handler.
            Console.WriteLine(InputLanguage.CurrentInputLanguage.LayoutName);
        }
    }
}