从在 WebBrowser 中托管的 JavaScript 调用 C# 方法
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本示例演示了如何从在 Windows 窗体应用程序中托管的 WebBrowser 控件内的网页中的 JavaScript 调用 C# 方法。
此示例演示了如何从 JavaScript 调用 C#。它还表明可以向 C# 方法传递参数。首先，创建一个 Windows 窗体应用程序。然后，将 WebBrowser 控件添加到您的窗体。然后修改窗体的代码，使其如下所示
namespace WindowsFormsApplication6
{
// This first namespace is required for the ComVisible attribute used on the ScriptManager class.
using System.Runtime.InteropServices;
using System.Windows.Forms;
// This is your form.
public partial class Form1 : Form
{
// This nested class must be ComVisible for the JavaScript to be able to call it.
[ComVisible(true)]
public class ScriptManager
{
// Variable to store the form of type Form1.
private Form1 mForm;
// Constructor.
public ScriptManager(Form1 form)
{
// Save the form so it can be referenced later.
mForm = form;
}
// This method can be called from JavaScript.
public void MethodToCallFromScript()
{
// Call a method on the form.
mForm.DoSomething();
}
// This method can also be called from JavaScript.
public void AnotherMethod(string message)
{
MessageBox.Show(message);
}
}
// This method will be called by the other method (MethodToCallFromScript) that gets called by JavaScript.
public void DoSomething()
{
// Indicate success.
MessageBox.Show("It worked!");
}
// Constructor.
public Form1()
{
// Boilerplate code.
InitializeComponent();
// Set the WebBrowser to use an instance of the ScriptManager to handle method calls to C#.
webBrowser1.ObjectForScripting = new ScriptManager(this);
// Create the webpage.
webBrowser1.DocumentText = @"<html>
<head>
<title>Test</title>
</head>
<body>
<input type=""button"" value=""Go!"" onclick=""window.external.MethodToCallFromScript();"" />
<br />
<input type=""button"" value=""Go Again!"" onclick=""window.external.AnotherMethod('Hello');"" />
</body>
</html>";
}
}
}请注意，您的应用程序可能属于除 WindowsFormsApplication6 之外的其他命名空间，但如果您严格按照上述说明操作，其余代码应该可以正常工作。我创建这个技巧/窍门是因为有人向我提出了一个问题，他们不理解 这个示例 我发送给他们。通过修复我发现的两个错误、添加未提及的 using 语句以及对代码进行大量注释，这个技巧/窍门使示例更容易理解。希望你们其他人也会觉得它有用。