.NET Core 中的 WebUtility.HtmlDecode 替换

Question

I need to decode HTML characters in .NET Core (MVC6). It looks like .NET Core doesn't have WebUtility.HtmlDecode function which everybody used for that purpose before. Is there a replacement exist in .NET Core?

Answer 1

This is in the System.Net.WebUtility class (Since .NET Standard 1.0) :

//
// Summary:
//     Provides methods for encoding and decoding URLs when processing Web requests.
public static class WebUtility
{
    public static string HtmlDecode(string value);
    public static string HtmlEncode(string value);
    public static string UrlDecode(string encodedValue);
    public static byte[] UrlDecodeToBytes(byte[] encodedValue, int offset, int count);
    public static string UrlEncode(string value);
    public static byte[] UrlEncodeToBytes(byte[] value, int offset, int count);
}

Answer 2

This is in Net Core 2.0

using System.Text.Encodings.Web;

and call it:

$"Please confirm your account by <a href='{HtmlEncoder.Default.Encode(link)}'>clicking here</a>.");

UPDATE : Also in .Net Core 2.1:

using System.Web;

HttpUtility.UrlEncode(code)
HttpUtility.UrlDecode(code)

Answer 3

我发现 WebUtility 库中的 HtmlDecode 函数可以工作。

System.Net.WebUtility.HtmlDecode(string)

Answer 4

You need add reference System.Net.WebUtility .

• It's already included in .Net Core 2 ( Microsoft.AspNetCore.All )

• Or you can install from NuGet - preview version for .Net Core 1.

So example, your code will be look like the below

public static string HtmlDecode(this string value)
{
     value = System.Net.WebUtility.HtmlDecode(value);
     return value;
}

Answer 5

namespace System.Web
{
    //
    // Summary:
    //     Provides methods for encoding and decoding URLs when processing Web requests.
    //     This class cannot be inherited.
    public sealed class HttpUtility
    {
        public HttpUtility();
        public static string HtmlAttributeEncode(string s);
        public static void HtmlAttributeEncode(string s, TextWriter output); 
        public static string HtmlDecode(string s);
        public static void HtmlDecode(string s, TextWriter output);
        public static string HtmlEncode(string s);
        public static string HtmlEncode(object value);
        public static void HtmlEncode(string s, TextWriter output);
        public static string JavaScriptStringEncode(string value);
        public static string JavaScriptStringEncode(string value, bool addDoubleQuotes);
        public static NameValueCollection ParseQueryString(string query);
        public static NameValueCollection ParseQueryString(string query, Encoding encoding);
        public static string UrlDecode(string str, Encoding e);
        public static string UrlDecode(byte[] bytes, int offset, int count, Encoding e);
        public static string UrlDecode(string str);
        public static string UrlDecode(byte[] bytes, Encoding e);
        public static byte[] UrlDecodeToBytes(byte[] bytes, int offset, int count);
        public static byte[] UrlDecodeToBytes(string str, Encoding e);
        public static byte[] UrlDecodeToBytes(byte[] bytes);
        public static byte[] UrlDecodeToBytes(string str);
        public static string UrlEncode(string str);
        public static string UrlEncode(string str, Encoding e);
        public static string UrlEncode(byte[] bytes);
        public static string UrlEncode(byte[] bytes, int offset, int count);
        public static byte[] UrlEncodeToBytes(string str);
        public static byte[] UrlEncodeToBytes(byte[] bytes);
        public static byte[] UrlEncodeToBytes(string str, Encoding e);
        public static byte[] UrlEncodeToBytes(byte[] bytes, int offset, int count);
        [Obsolete("This method produces non-standards-compliant output and has interoperability issues. The preferred alternative is UrlEncode(String).")]
        public static string UrlEncodeUnicode(string str);
        [Obsolete("This method produces non-standards-compliant output and has interoperability issues. The preferred alternative is UrlEncodeToBytes(String).")]
        public static byte[] UrlEncodeUnicodeToBytes(string str);
        public static string UrlPathEncode(string str);
    }
}

You can use HttpUtility class in .net core for decoding or encoding.

hope it will work.

Answer 6

HtmlDecode and most of the *Decode methods were not ported to CoreFx. Only the *Encode methods are available.

Here's what's available today: https://github.com/dotnet/corefx/blob/1dfe38aeb2811fbbd6d4de36d210f060e80d50a6/src/System.Text.Encodings.Web/src/System/Text/Encodings/Web/HtmlEncoder.cs

Answer 7

It isn't the answer, but it is my hint how to solve such kind of issues. It is helpful in case only if you are using ReSharper .

I had started to develop on .NET Core apps and met a lof of issues like I didn't know a name of packages where my usual classes are located. ReShareper has the great functionality to solve this:

Check out next article for more details - Finding, Exploring, and Installing NuGet Packages . This functionality saved a lot of my time.

EDIT: You don't need ReSharper now because Visual Studio 2017 has similar functionality - Visual Studio 2017 can automatically recommend NuGet packages for unknown types.