Last updated: April 13, 2026
Env Validator for C# / .NET Developers
Quick Answer
DevToolHQ's env validator works great alongside C# / .NET. Use it to quickly env validator during development, then integrate the pattern into your C# / .NET codebase using the code example below.
Use Cases in C# / .NET
- 1.Validate required env vars at application startup
- 2.Catch missing configuration before deployment
- 3.Type-check environment variable values
- 4.Provide clear error messages for missing config
C# / .NET Code Example
using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.DependencyInjection;
// appsettings.json + env override pattern (ASP.NET Core)
var builder = WebApplication.CreateBuilder(args);
// Access env var
var dbUrl = builder.Configuration["DATABASE_URL"]
?? throw new InvalidOperationException("DATABASE_URL is required");
// Strongly typed config
builder.Services.AddOptions<AppSettings>()
.Bind(builder.Configuration.GetSection("App"))
.ValidateDataAnnotations()
.ValidateOnStart();
record AppSettings {
[Required] public string DatabaseUrl { get; init; } = "";
public int Port { get; init; } = 5000;
}Try the tool directly
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Frequently Asked Questions
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