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Rick-AndersonRick-Anderson
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Update debug code to not use Startup /2
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‎aspnetcore/test/troubleshoot.md‎

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description: Understand and troubleshoot warnings and errors with ASP.NET Core projects.
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ms.author: tdykstra
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ms.custom: mvc
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ms.date: 07/10/2019
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ms.date: 5/2/2025
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uid: test/troubleshoot
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---
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# Troubleshoot and debug ASP.NET Core projects
@@ -79,85 +79,11 @@ Place the following [middleware](xref:fundamentals/middleware/index#create-a-mid
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To obtain the environment, use either of the following approaches:
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* Inject the `IHostingEnvironment` into the `Startup.Configure` method and check the environment with the local variable. The following sample code demonstrates this approach.
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* Assign the environment to a property in the `Startup` class. Check the environment using the property (for example, `if (Environment.IsDevelopment())`).
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```csharp
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public void Configure(IApplicationBuilder app, IHostingEnvironment env,
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IConfiguration config)
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{
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if (env.IsDevelopment())
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{
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app.Run(async (context) =>
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{
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var sb = new StringBuilder();
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var nl = System.Environment.NewLine;
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var rule = string.Concat(nl, new string('-', 40), nl);
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var authSchemeProvider = app.ApplicationServices
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.GetRequiredService<IAuthenticationSchemeProvider>();
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sb.Append($"Request{rule}");
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sb.Append($"{DateTimeOffset.Now}{nl}");
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sb.Append($"{context.Request.Method} {context.Request.Path}{nl}");
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sb.Append($"Scheme: {context.Request.Scheme}{nl}");
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sb.Append($"Host: {context.Request.Headers["Host"]}{nl}");
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sb.Append($"PathBase: {context.Request.PathBase.Value}{nl}");
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sb.Append($"Path: {context.Request.Path.Value}{nl}");
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sb.Append($"Query: {context.Request.QueryString.Value}{nl}{nl}");
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sb.Append($"Connection{rule}");
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sb.Append($"RemoteIp: {context.Connection.RemoteIpAddress}{nl}");
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sb.Append($"RemotePort: {context.Connection.RemotePort}{nl}");
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sb.Append($"LocalIp: {context.Connection.LocalIpAddress}{nl}");
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sb.Append($"LocalPort: {context.Connection.LocalPort}{nl}");
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sb.Append($"ClientCert: {context.Connection.ClientCertificate}{nl}{nl}");
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sb.Append($"Identity{rule}");
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sb.Append($"User: {context.User.Identity.Name}{nl}");
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var scheme = await authSchemeProvider
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.GetSchemeAsync(IISDefaults.AuthenticationScheme);
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sb.Append($"DisplayName: {scheme?.DisplayName}{nl}{nl}");
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sb.Append($"Headers{rule}");
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foreach (var header in context.Request.Headers)
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{
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sb.Append($"{header.Key}: {header.Value}{nl}");
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}
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sb.Append(nl);
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sb.Append($"WebSockets{rule}");
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if (context.Features.Get<IHttpUpgradeFeature>() != null)
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{
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sb.Append($"Status: Enabled{nl}{nl}");
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}
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else
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{
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sb.Append($"Status: Disabled{nl}{nl}");
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}
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sb.Append($"Configuration{rule}");
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foreach (var pair in config.AsEnumerable())
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{
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sb.Append($"{pair.Path}: {pair.Value}{nl}");
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}
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sb.Append(nl);
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sb.Append($"Environment Variables{rule}");
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var vars = System.Environment.GetEnvironmentVariables();
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foreach (var key in vars.Keys.Cast<string>().OrderBy(key => key,
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StringComparer.OrdinalIgnoreCase))
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{
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var value = vars[key];
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sb.Append($"{key}: {value}{nl}");
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}
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context.Response.ContentType = "text/plain";
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await context.Response.WriteAsync(sb.ToString());
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});
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}
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}
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```
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* Inject `IHostingEnvironment` and check the environment with the local variable. The following sample code demonstrates this approach.
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* Assign the environment to a property in `Program.cs`. Check the environment using the property, for example, `if (app.Environment.IsDevelopment())`.
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:::code language="csharp" source="~/test/troubleshoot/code/9.x/Program.cs" id="snippet1" highlight="13-85":::
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## Debug ASP.NET Core apps
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‎aspnetcore/test/troubleshoot/code/5.x/Program.cs‎

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This file was deleted.

‎aspnetcore/test/troubleshoot/code/9.x/Program.cs‎

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using Microsoft.AspNetCore.Authentication;
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using Microsoft.AspNetCore.Http.Features;
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using Microsoft.AspNetCore.Server.IISIntegration;
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using System.Text;
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var builder = WebApplication.CreateBuilder(args);
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builder.Services.AddAuthentication();
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var app = builder.Build();
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app.MapGet("/", () => "Hello World!");
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if (app.Environment.IsDevelopment())
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{
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app.Run(async (context) =>
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{
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var sb = new StringBuilder();
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var nl = System.Environment.NewLine;
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var rule = string.Concat(nl, new string('-', 40), nl);
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var authSchemeProvider = app.Services.GetRequiredService<IAuthenticationSchemeProvider>();
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sb.Append($"Request{rule}");
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sb.Append($"{DateTimeOffset.Now}{nl}");
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sb.Append($"{context.Request.Method} {context.Request.Path}{nl}");
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sb.Append($"Scheme: {context.Request.Scheme}{nl}");
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sb.Append($"Host: {context.Request.Headers["Host"]}{nl}");
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sb.Append($"PathBase: {context.Request.PathBase.Value}{nl}");
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sb.Append($"Path: {context.Request.Path.Value}{nl}");
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sb.Append($"Query: {context.Request.QueryString.Value}{nl}{nl}");
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sb.Append($"Connection{rule}");
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sb.Append($"RemoteIp: {context.Connection.RemoteIpAddress}{nl}");
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sb.Append($"RemotePort: {context.Connection.RemotePort}{nl}");
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sb.Append($"LocalIp: {context.Connection.LocalIpAddress}{nl}");
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sb.Append($"LocalPort: {context.Connection.LocalPort}{nl}");
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sb.Append($"ClientCert: {context.Connection.ClientCertificate}{nl}{nl}");
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sb.Append($"Identity{rule}");
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sb.Append($"User: {context.User.Identity.Name}{nl}");
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var scheme = await authSchemeProvider
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.GetSchemeAsync(IISDefaults.AuthenticationScheme);
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sb.Append($"DisplayName: {scheme?.DisplayName}{nl}{nl}");
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sb.Append($"Headers{rule}");
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foreach (var header in context.Request.Headers)
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{
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sb.Append($"{header.Key}: {header.Value}{nl}");
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}
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sb.Append(nl);
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sb.Append($"WebSockets{rule}");
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if (context.Features.Get<IHttpUpgradeFeature>() != null)
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{
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sb.Append($"Status: Enabled{nl}{nl}");
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}
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else
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{
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sb.Append($"Status: Disabled{nl}{nl}");
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}
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sb.Append($"Configuration{rule}");
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var config = builder.Configuration;
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foreach (var pair in config.AsEnumerable())
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{
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sb.Append($"{pair.Key}: {pair.Value}{nl}");
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}
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sb.Append(nl);
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sb.Append(nl);
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sb.Append($"Environment Variables{rule}");
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var vars = System.Environment.GetEnvironmentVariables();
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foreach (var key in vars.Keys.Cast<string>().OrderBy(key => key,
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StringComparer.OrdinalIgnoreCase))
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{
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var value = vars[key];
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sb.Append($"{key}: {value}{nl}");
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}
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context.Response.ContentType = "text/plain";
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await context.Response.WriteAsync(sb.ToString());
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});
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}
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app.Run();

‎aspnetcore/test/troubleshoot/code/9.x/WebDbgr.csproj‎

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<Project Sdk="Microsoft.NET.Sdk.Web">
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<PropertyGroup>
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<TargetFramework>net9.0</TargetFramework>
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<Nullable>enable</Nullable>
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<ImplicitUsings>enable</ImplicitUsings>
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</PropertyGroup>
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</Project>

‎aspnetcore/test/troubleshoot/code/9.x/appsettings.json‎

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{
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"Logging": {
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"LogLevel": {
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"Default": "Information",
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"Microsoft.AspNetCore": "Warning"
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}
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},
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"AllowedHosts": "*"
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}

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