. Solution to the problem of Chinese garbled code when net core reads files

background

In use today core web api Upload txt The documentation was going well , But a test found that the Chinese content read was garbled , I wonder .

Out of experience , Immediately put the code Encoding.Default Change to Encoding.uft8, I can't find it . Then simply save the uploaded file as next , Specially selected with bom Of utf8 Options .

But it is still garbled . depressed .

problem

So under the instinctive Baidu , There are a lot of ways to find , But none of them can solve the problem .

unconsciously , Found a link , Found the official website    as follows  

https://docs.microsoft.com/zh-cn/dotnet/api/system.text.encoding.default?view=netcore-3.1#System_Text_Encoding_Default

After go in , Be suddenly enlightened . That's what it says , About Encoding.Default The definition of attribute is as follows .

.NET Framework Default properties in

stay Windows On the table .NET Framework in , Default Property always gets the active code page of the system and creates Encoding Its corresponding object .  The active code page may be ANSI code page , These include ASCII Character set and other characters different from the code page .  Because of all Default be based on ANSI The coding of the code page will lose data , So please consider Encoding.UTF8 Use encoding instead .  stay U + 00 To U + 7F Within the scope of ,UTF-8 It's usually the same , But it can be done without losing ASCII Encode characters outside the range .

.NET Core Default properties on

stay .NET Core in , Default  Property always returns  UTF8Encoding .  Running .NET Core All operating systems of the application （Windows、Linux and macOS） All of us support UTF-8.

terms of settlement

So,.NET Framework The default encoding in is GB2312, And in the .NET Core China does not support it. , If you want to use, you must first register the code

The code is as follows

var completeFilePath = Path.Combine(filePath, saveName);
                    var stream = formFile.OpenReadStream();
                    Encoding.RegisterProvider(CodePagesEncodingProvider.Instance);
                    Encoding encoding = Encoding.GetEncoding("gb2312");
                    using var reader = new StreamReader(stream, encoding);
                    var input = reader.ReadToEnd();

Here we are , Problem solving .