blocks|key|4569079|text|您可以使用名称空间Microsoft.IdentityModel.Tokens中的类Base64UrlEncoder。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|4569080|const+string+StringToEncode+=+"He=llo%2BWo/rld";

var+encodedStr+=+Base64UrlEncoder.Encode(StringToEncode);
var+decodedStr+=+Base64UrlEncoder.Decode(encodedStr);

if+(decodedStr+==+StringToEncode)
++++Console.WriteLine("It+works!");
else
++++Console.WriteLine("Dangit!");|code-block|syntax|javascript|4569081|entityMap^0|9|U|16|G|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@$9|N|A|O|B|C]|$9|P|A|Q|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|R|8|@]|D|@]|E|$I|J]]|$1|K|3|-4|5|6|7|S|8|@]|D|@]|E|$]]]|L|$]]

You can use class <code>Base64UrlEncoder</code> from namespace <code>Microsoft.IdentityModel.Tokens</code>.

<pre><code>const string StringToEncode = "He=llo+Wo/rld";

var encodedStr = Base64UrlEncoder.Encode(StringToEncode);
var decodedStr = Base64UrlEncoder.Decode(encodedStr);

if (decodedStr == StringToEncode)
 Console.WriteLine("It works!");
else
 Console.WriteLine("Dangit!");
</code></pre>

blocks|key|4569148|text|如果你使用的是ASP.NET核心，另一个选择是使用Microsoft.AspNetCore.WebUtilities.WebEncoders.Base64UrlEncode。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|4569149|如果您没有使用ASP.NET核心，可以在Apache+2.0+License下使用the+WebEncoders+source。|4569150|entityMap|0|LINK|mutability|MUTABLE|url|https://docs.microsoft.com/en-us/dotnet/api/microsoft.aspnetcore.webutilities.webencoders.base64urlencode|1|https://github.com/dotnet/aspnetcore/blob/master/LICENSE.txt|2|https://github.com/dotnet/aspnetcore/blob/master/src/Shared/WebEncoders/WebEncoders.cs^0|P|1P|P|1P|0|0|19|B|K|I|1|15|M|2|0^^$0|@$1|2|3|4|5|6|7|T|8|@$9|U|A|V|B|C]]|D|@$9|W|A|X|1|Y]]|E|$]]|$1|F|3|G|5|6|7|Z|8|@$9|10|A|11|B|C]]|D|@$9|12|A|13|1|14]|$9|15|A|16|1|17]]|E|$]]|$1|H|3|-4|5|6|7|18|8|@]|D|@]|E|$]]]|I|$J|$5|K|L|M|E|$N|O]]|P|$5|K|L|M|E|$N|Q]]|R|$5|K|L|M|E|$N|S]]]]

Another option, if you are using ASP.NET Core, would be to use <a href="https://docs.microsoft.com/en-us/dotnet/api/microsoft.aspnetcore.webutilities.webencoders.base64urlencode" rel="noreferrer"><code>Microsoft.AspNetCore.WebUtilities.WebEncoders.Base64UrlEncode</code></a>.

If you are not using ASP.NET Core, <a href="https://github.com/dotnet/aspnetcore/blob/master/src/Shared/WebEncoders/WebEncoders.cs" rel="noreferrer">the <code>WebEncoders</code> source</a> is available under the <a href="https://github.com/dotnet/aspnetcore/blob/master/LICENSE.txt" rel="noreferrer">Apache 2.0 License</a>.

blocks|key|4569105|text|基于这里的答案和一些性能上的改进，我们发布了一个非常容易使用的带有源代码available+on+GitHub+(麻省理工学院许可的)的url-safe+base64+implementation+to+NuGet。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|4569106|使用起来很简单，就像|4569107|var+bytes+=+Encoding.UTF8.GetBytes("Foo");
var+encoded+=+UrlBase64.Encode(bytes);
var+decoded+=+UrlBase64.Decode(encoded);|code-block|syntax|javascript|4569108|entityMap|0|LINK|mutability|MUTABLE|url|https://github.com/neosmart/UrlBase64/|1|https://www.nuget.org/packages/UrlBase64/^0|10|J|0|1W|13|1|0|0|0^^$0|@$1|2|3|4|5|6|7|U|8|@]|9|@$A|V|B|W|1|X]|$A|Y|B|Z|1|10]]|C|$]]|$1|D|3|E|5|6|7|11|8|@]|9|@]|C|$]]|$1|F|3|G|5|H|7|12|8|@]|9|@]|C|$I|J]]|$1|K|3|-4|5|6|7|13|8|@]|9|@]|C|$]]]|L|$M|$5|N|O|P|C|$Q|R]]|S|$5|N|O|P|C|$Q|T]]]]

Based off the answers here with some performance improvements, we've published a very easy to use <a href="https://www.nuget.org/packages/UrlBase64/" rel="noreferrer">url-safe base64 implementation to NuGet</a> with the source code <a href="https://github.com/neosmart/UrlBase64/" rel="noreferrer">available on GitHub</a> (MIT licensed).

Usage is as easy as

<pre><code>var bytes = Encoding.UTF8.GetBytes("Foo");
var encoded = UrlBase64.Encode(bytes);
var decoded = UrlBase64.Decode(encoded);
</code></pre>

blocks|key|4569055|text|要获得类似于RFC4648的安全的编码，而不是根据RFC4648的"base64url“，请使用System.Web.HttpServerUtility.UrlTokenEncode(bytes)进行编码，使用System.Web.HttpServerUtility.UrlTokenDecode(bytes)进行解码。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|4569056|entityMap^0|1C|1E|2X|1E|0^^$0|@$1|2|3|4|5|6|7|H|8|@$9|I|A|J|B|C]|$9|K|A|L|B|C]]|D|@]|E|$]]|$1|F|3|-4|5|6|7|M|8|@]|D|@]|E|$]]]|G|$]]

To get an URL-safe base64-like encoding, but not "base64url" according to RFC4648, use <code>System.Web.HttpServerUtility.UrlTokenEncode(bytes)</code> to encode, and 
<code>System.Web.HttpServerUtility.UrlTokenDecode(bytes)</code> to decode.

blocks|key|4569361|text|最简单的解决方案：(没有填充)|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4569362|private+static+string+Base64UrlEncode(string+input)+{
++++var+inputBytes+=+System.Text.Encoding.UTF8.GetBytes(input);
++++//+Special+"url-safe"+base64+encode.
++++return+Convert.ToBase64String(inputBytes)
++++++.Replace('%2B',+'-')+//+replace+URL+unsafe+characters+with+safe+ones
++++++.Replace('/',+'_')+//+replace+URL+unsafe+characters+with+safe+ones
++++++.Replace("=",+"");+//+no+padding
++}|code-block|syntax|javascript|4569363|归功于：Tholle|offset|length|4569364|entityMap|0|LINK|mutability|MUTABLE|url|https://stackoverflow.com/a/30246618/592651^0|0|0|4|6|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|T|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|U|8|@]|9|@$I|V|J|W|1|X]]|A|$]]|$1|K|3|-4|5|6|7|Y|8|@]|9|@]|A|$]]]|L|$M|$5|N|O|P|A|$Q|R]]]]

Simplest solution:
(with no padding)

<pre><code>private static string Base64UrlEncode(string input) {
 var inputBytes = System.Text.Encoding.UTF8.GetBytes(input);
 // Special "url-safe" base64 encode.
 return Convert.ToBase64String(inputBytes)
 .Replace('+', '-') // replace URL unsafe characters with safe ones
 .Replace('/', '_') // replace URL unsafe characters with safe ones
 .Replace("=", ""); // no padding
 }
</code></pre>

Credit goes to: <a href="https://stackoverflow.com/a/30246618/592651">Tholle</a>

blocks|key|63168|text|++++public+string+Decode(string+str)
++++{
+++++++byte[]+decbuff+=+Convert.FromBase64String(str.Replace(",",+"=").Replace("-",+"%2B").Replace("/",+"_"));
+++++++return+System.Text.Encoding.UTF8.GetString(decbuff);
++++}
++++
++++public+string+Encode(string+input)
++++{
++++++++byte[]+encbuff+=+Encoding.UTF8.GetBytes(input+??+"");
++++++++return+Convert.ToBase64String(encbuff).Replace("=",+",").Replace("%2B",+"-").Replace("_",+"/");
++++}|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|63169|这就是与JavaScript保持一致的方法！|unstyled|63170|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$B|C]]|$1|D|3|E|5|F|7|J|8|@]|9|@]|A|$]]|$1|G|3|-4|5|F|7|K|8|@]|9|@]|A|$]]]|H|$]]

<pre><code> public string Decode(string str)
 {
 byte[] decbuff = Convert.FromBase64String(str.Replace(&quot;,&quot;, &quot;=&quot;).Replace(&quot;-&quot;, &quot;+&quot;).Replace(&quot;/&quot;, &quot;_&quot;));
 return System.Text.Encoding.UTF8.GetString(decbuff);
 }
 
 public string Encode(string input)
 {
 byte[] encbuff = Encoding.UTF8.GetBytes(input ?? &quot;&quot;);
 return Convert.ToBase64String(encbuff).Replace(&quot;=&quot;, &quot;,&quot;).Replace(&quot;+&quot;, &quot;-&quot;).Replace(&quot;_&quot;, &quot;/&quot;);
 }
</code></pre>
This is the way to do it to align with JavaScript!

blocks|key|62843|text|这里是解码url安全base64的另一种方法，该url安全url是通过与Marc相同的方式编码的。我就是不明白为什么4-length%254能工作(确实如此)。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|62844|如下所示，只有原点的位长是6和8的公倍数，base64不会在结果后面附加"=“。|62845|1+2+3+4+5+6+7+8%7C1+2+3+4+5+6+7+8%7C1+2+3+4+5+6+7+8+
1+2+3+4+5+6%7C1+2+3+4+5+6%7C1+2+3+4+5+6%7C1+2+3+4+5+6
++++++++++++++++"=="++++++++++++"="|code-block|syntax|javascript|62846|所以我们可以反其道而行之，如果result的位长不能被8整除，那么它就被追加了：|62847|base64String+=+base64String.Replace("-",+"%2B").Replace("_",+"/");
var+base64+=+Encoding.ASCII.GetBytes(base64String);
var+padding+=+base64.Length+*+3+%25+4;//(base64.Length*6+%25+8)/2
if+(padding+!=+0)
{
++++base64String+=+base64String.PadRight(base64String.Length+%2B+padding,+'=');
}
return+Convert.FromBase64String(base64String);|62848|entityMap^0|1M|A|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@$9|T|A|U|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|V|8|@]|D|@]|E|$]]|$1|H|3|I|5|J|7|W|8|@]|D|@]|E|$K|L]]|$1|M|3|N|5|6|7|X|8|@]|D|@]|E|$]]|$1|O|3|P|5|J|7|Y|8|@]|D|@]|E|$K|L]]|$1|Q|3|-4|5|6|7|Z|8|@]|D|@]|E|$]]]|R|$]]

Here is another method to decode an url-safe base64 was encode by same way with Marc. I just don't get why <code>4-length%4</code> worked(it does).

As follows, only the origin's bit length are common multiple of 6 and 8, base64 do not append "=" to result.

<pre><code>1 2 3 4 5 6 7 8|1 2 3 4 5 6 7 8|1 2 3 4 5 6 7 8 
1 2 3 4 5 6|1 2 3 4 5 6|1 2 3 4 5 6|1 2 3 4 5 6
 "==" "="
</code></pre>

So we can do it conversely, if result's bit length can't divisible by 8, it has been appended:

<pre><code>base64String = base64String.Replace("-", "+").Replace("_", "/");
var base64 = Encoding.ASCII.GetBytes(base64String);
var padding = base64.Length * 3 % 4;//(base64.Length*6 % 8)/2
if (padding != 0)
{
 base64String = base64String.PadRight(base64String.Length + padding, '=');
}
return Convert.FromBase64String(base64String);
</code></pre>

blocks|key|4569268|text|在UWP中使用Microsoft加密引擎。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4569269|uint+length+=+32;

IBuffer+buffer+=+CryptographicBuffer.GenerateRandom(length);
string+base64Str+=+CryptographicBuffer.EncodeToBase64String(buffer)
+++++++++++++++++++//+ensure+url+safe
+++++++++++++++++++.TrimEnd('=').Replace('%2B',+'-').Replace('/',+'_');

return+base64Str;|code-block|syntax|javascript|4569270|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

Using Microsoft cryptographic engine in UWP.

<pre><code>uint length = 32;

IBuffer buffer = CryptographicBuffer.GenerateRandom(length);
string base64Str = CryptographicBuffer.EncodeToBase64String(buffer)
 // ensure url safe
 .TrimEnd('=').Replace('+', '-').Replace('/', '_');

return base64Str;
</code></pre>

blocks|key|4569312|text|Karanvir+Kang的回答不错，我投了赞成票。但是，它确实会在字符串的末尾留下一个奇数字符(表示删除的填充字符数)。这是我的解决方案。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4569313|var+bytesToEncode+=+System.Text.Encoding.UTF8.GetBytes("StringToEncode");+
var+bytesEncodedPadded+=+HttpServerUtility.UrlTokenEncode(bytesToEncode);
var+objectIdBase64+=+bytesEncodedPadded.Substring(0,+bytesEncodedPadded.Length+-+1);|code-block|syntax|javascript|4569314|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

Karanvir Kang's answer is a good one and I voted for it. However, it does leave an odd character on the end of the string (indicating the number of padding characters removed). Here is my solution.

<pre><code>var bytesToEncode = System.Text.Encoding.UTF8.GetBytes("StringToEncode"); 
var bytesEncodedPadded = HttpServerUtility.UrlTokenEncode(bytesToEncode);
var objectIdBase64 = bytesEncodedPadded.Substring(0, bytesEncodedPadded.Length - 1);
</code></pre>

I want to achieve Base64 URL safe encoding in C#. In Java, we have the common <code>Codec</code> library which gives me an URL safe encoded string. How can I achieve the same using C#?

<pre><code>byte[] toEncodeAsBytes = System.Text.ASCIIEncoding.ASCII.GetBytes("StringToEncode");
string returnValue = System.Convert.ToBase64String(toEncodeAsBytes);
</code></pre>

The above code converts it to Base64, but it pads <code>==</code>. Is there is way to achieve URL safe encoding?

How to achieve Base64 URL safe encoding in C#?

我想在C#中实现Base64网址的安全编码。在Java语言中，我们有一个通用的Codec库，它为我提供了一个安全的URL编码字符串。如何使用C#实现相同的功能？byte[] toEncodeAsBytes = System.Text.ASCIIEncoding.ASCII.GetBytes("StringToEncode");string returnValue = System.Convert.

问如何在C#中实现Base64网址的安全编码？
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