. net core minimal API upload file

.net 6 Released a new feature Minimal APIs, similar NancyFx frame .

Use Minimal APIs , I feel like I've known you before , Follow asp It's written in a similar way , Don't worry about the messy frame .

for instance ： Three lines of code can implement a simple back-end api:

var app = WebApplication.Create(args);
app.MapGet("/",()=>"Hello World!");
app.Run();

Minimalist thinking , make a great bit , hope Entity Framework There are similar simplified versions , similar Java In the technology stack MyBatis, A lot of freedom , Easy to get started , Easy to understand .

Now learn how to use Minimal api Write a file to upload webapi:
Back end code ：

var app = WebApplication.Create(args);
app.MapGet("/", () => "Hello .net mini api");
app.MapPost("/upload", async Task<IResult> (HttpRequest request) =>
 {
     if (!request.HasFormContentType)
     {
         return Results.BadRequest();
     }
     var form = await request.ReadFormAsync();
     var formFile = form.Files["file"];
     if (formFile is null || formFile.Length == 0)
         return Results.BadRequest();
     
     await using var stream = formFile.OpenReadStream();
     var reader = new StreamReader(stream);
     var text = await reader.ReadToEndAsync();
     return Results.Ok(text);
 });
app.Run();

Here comes Upload text , Read and return function .
Use Fiddler test ：