C# WebBrowser 设置独立的代理

近期需要对webbrower设置代理，找到了如下方案：

对修改注册表，设置全局代理

这种方法限制在一个进程内只能设置或取消代理，而且是全局代理，对于部分不需要代理对功能会产生影响

通过函数InternetSetOption实现修改当前程序中的WebBrowser设置

 1 static class WebBrowserProxy
 2  
 3 {
 4  
 5     struct Struct_INTERNET_PROXY_INFO
 6  
 7     {
 8  
 9         public int dwAccessType;
10  
11         public IntPtr proxy;
12  
13         public IntPtr proxyBypass;
14  
15     };
16  
17  
18  
19     [DllImport("wininet.dll", SetLastError = true)]
20  
21     static extern bool InternetSetOption(IntPtr hInternet, int dwOption, IntPtr lpBuffer,int lpdwBufferLength);
22  
23  
24  
25     public static void SetProxy(string strProxy = "127.0.0.1:8888")
26  
27     {
28  
29         const int INTERNET_OPTION_PROXY = 38;
30  
31         const int INTERNET_OPEN_TYPE_PROXY = 3;
32  
33  
34  
35         Struct_INTERNET_PROXY_INFO struct_IPI;
36  
37  
38  
39         // Filling in structure
40   
41        struct_IPI.dwAccessType = INTERNET_OPEN_TYPE_PROXY;
42  
43         struct_IPI.proxy = Marshal.StringToHGlobalAnsi(strProxy);
44  
45         struct_IPI.proxyBypass = Marshal.StringToHGlobalAnsi("local");
46  
47  
48  
49         // Allocating memory
50  
51         IntPtr intptrStruct = Marshal.AllocCoTaskMem(Marshal.SizeOf(struct_IPI));
52  
53  
54  
55         // Converting structure to IntPtr
56  
57         Marshal.StructureToPtr(struct_IPI, intptrStruct, true);
58  
59         bool iReturn = InternetSetOption(IntPtr.Zero, INTERNET_OPTION_PROXY, intptrStruct, Marshal.SizeOf(struct_IPI));
60  
61     }
62  
63 }