您应该只对用户名或URL中可能无效的其他部分进行编码。URL编码URL可能会导致这样的问题:

string url = HttpUtility.UrlEncode("http://www.google.com/search?q=Example");

将产生

http 3a % 2f 2fwww。google。com % 2fsearch 3fq % 3dExample

这显然不会有很好的效果。相反，你应该在查询字符串中只编码键/值对的值，就像这样:

string url = "http://www.google.com/search?q=" + HttpUtility.UrlEncode("Example");

希望这有帮助。另外，正如teedyay提到的，您仍然需要确保非法文件名字符被删除，否则文件系统将不喜欢该路径。

对于。net核心用户，使用这个

Microsoft.AspNetCore.Http.Extensions.UriHelper.Encode(Uri uri)

如果你看不见系统。Web，更改项目设置。目标框架应该是。NET Framework 4“代替”。NET Framework 4客户端配置文件

从。net Framework 4.5和。net Standard 1.0开始，你应该使用WebUtility.UrlEncode。相对于其他选择的优势:

It is part of .NET Framework 4.5+, .NET Core 1.0+, .NET Standard 1.0+, UWP 10.0+ and all Xamarin platforms as well. HttpUtility, while being available in .NET Framework earlier (.NET Framework 1.1+), becomes available on other platforms much later (.NET Core 2.0+, .NET Standard 2.0+) and it still unavailable in UWP (see related question). In .NET Framework, it resides in System.dll, so it does not require any additional references, unlike HttpUtility. It properly escapes characters for URLs, unlike Uri.EscapeUriString (see comments to drweb86's answer). It does not have any limits on the length of the string, unlike Uri.EscapeDataString (see related question), so it can be used for POST requests, for example.

我写了一个对所有符号进行url编码的c#方法:

    /// <summary>
    /// !#$345Hf} → %21%23%24%33%34%35%48%66%7D
    /// </summary>
    public static string UrlEncodeExtended( string value )
    {
        char[] chars = value.ToCharArray();
        StringBuilder encodedValue = new StringBuilder();
        foreach (char c in chars)
        {
            encodedValue.Append( "%" + ( (int)c ).ToString( "X2" ) );
        }
        return encodedValue.ToString();
    }

除了@丹·赫伯特的回答， 我们应该对一般的值进行编码。

Split有参数Split('&'，'=');表达式首先被&分割，然后是'='，因此奇数元素都是要编码的值，如下所示。

public static void EncodeQueryString(ref string queryString)
{
    var array=queryString.Split('&','=');
    for (int i = 0; i < array.Length; i++) {
        string part=array[i];
        if(i%2==1)
        {               
            part=System.Web.HttpUtility.UrlEncode(array[i]);
            queryString=queryString.Replace(array[i],part);
        }
    }
}