Question 85658 in ASP.NET Question posted in
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How to enable CORS in a C# application? – Asp.net

I’m building a C# application for which i have to update in database and that needs to make requests to an API running on a different domain. However, when I try to make these requests, I’m getting CORS errors.

I’ve read about CORS and understand that it’s a security feature that browsers use to prevent cross-domain requests, but I’m not sure how to enable it in my C# application.

Can someone please explain how to enable CORS in a C# application and provide an example of how to make a cross-domain request using CORS? Thanks in advance!

I had tried to install "Microsoft.AspNetCore.Cors" from package manager but is not working.

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3

Answers


  1. 0

    Copy And Paste In Program.cs

    builder.Services.AddCors(o => o.AddPolicy("MyPolicy", builder =>
{
    builder.WithOrigins("*")
           .AllowAnyMethod()
           .AllowAnyHeader();

// U Can Filter Here
}));

    Then write this, also in Program.cs. But write it in the correct order, after app.UseRouting(); and before app.UseAuthentication(); – https://learn.microsoft.com/en-us/aspnet/core/fundamentals/middleware/?view=aspnetcore-7.0#middleware-order

    app.UseCors("MyPolicy");
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  2. 0

    using (var client = new HttpClient())

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  3. 0

    In C# MVC application we can add Microsoft.AspNet.WebApi.Cors NuGet package. After successfully installing this package use the below line in a controller,

    using System.Web.Http.Cors;

    And, EnableCORS before defining APIs like:

    [HttpPost]
[EnableCors(origins: "*", methods: "*", headers: "*")]
public int GetId(int id)
{
     return id;
}
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