Debug Attributes in .NET

Problem

Debugging gets slower when the debugger shows the wrong details.

You hit a breakpoint, expand an object, and instead of seeing the one or two values you actually care about, you get a noisy graph of backing fields, internal collections, and framework plumbing. Then you step through code and end up inside helper methods that you never wanted to inspect in the first place.

That usually creates a few common problems:

• important state is harder to spot quickly
• developers waste time expanding object trees during debugging
• stepping through code becomes noisy and distracting
• domain objects look less meaningful in the debugger than they do in the codebase

The code may be correct, but the debugging experience is still poor.

Solution

Use .NET debugger attributes to shape how code appears while debugging.

The most useful ones for day-to-day work are:

• DebuggerDisplayAttribute to control how an object is shown
• DebuggerBrowsableAttribute to hide or flatten members in debugger views
• DebuggerStepThroughAttribute to avoid stepping into low-value plumbing code

These attributes are built into the framework. No NuGet package is required for the examples in this post. They work with the .NET 10 SDK and come from System.Diagnostics.

Used well, they make debugging faster without changing production behavior.

Description

DebuggerDisplayAttribute: show the values that matter

The most common debugging issue is that a useful domain object looks vague in the watch window.

Without a debugger display attribute:

public sealed class Order
{
    public Guid Id { get; init; }
    public string CustomerName { get; init; } = string.Empty;
    public decimal Total { get; init; }
    public string Currency { get; init; } = "USD";
}

In many debuggers, that object will initially appear as just Order, which means you have to expand it every time.

With DebuggerDisplayAttribute:

using System.Diagnostics;

[DebuggerDisplay("{CustomerName} - {Total} {Currency}")]
public sealed class Order
{
    public Guid Id { get; init; }
    public string CustomerName { get; init; } = string.Empty;
    public decimal Total { get; init; }
    public string Currency { get; init; } = "USD";
}

Now the debugger shows a compact, human-readable summary immediately.

That is a small change, but it matters a lot when you are inspecting many instances in a loop or tracing an issue across a request pipeline.

DebuggerBrowsableAttribute: reduce noise in complex types

Sometimes the object is not the problem. The problem is one overly noisy property.

For example, a shopping cart may expose a read-only summary that is useful in code, but not especially helpful in every debugger expansion.

using System.Diagnostics;

public sealed class Cart
{
    public List<CartItem> Items { get; } = [];

    [DebuggerBrowsable(DebuggerBrowsableState.Never)]
    public decimal Total => Items.Sum(x => x.Price * x.Quantity);
}

public sealed class CartItem
{
    public string Sku { get; init; } = string.Empty;
    public int Quantity { get; init; }
    public decimal Price { get; init; }
}

DebuggerBrowsableState.Never hides the property from the debugger view while leaving the property fully available at runtime.

That is useful when:

• a property adds noise but not insight
• a computed member is obvious from surrounding state
• you want the debugger to emphasize the real working data

There is also DebuggerBrowsableState.RootHidden, which can be useful when you want a wrapper type to expose its underlying collection items directly in the debugger.

using System.Diagnostics;

public sealed class ValidationErrors
{
    private readonly string[] _errors;

    public ValidationErrors(IEnumerable<string> errors)
    {
        _errors = errors.ToArray();
    }

    [DebuggerBrowsable(DebuggerBrowsableState.RootHidden)]
    public string[] Items => _errors;
}

That makes the debugger display the collection contents directly instead of forcing you through an unnecessary wrapper node.

DebuggerStepThroughAttribute: skip low-value implementation detail

Some methods are correct, stable, and not worth stepping into every time.

That is where DebuggerStepThroughAttribute helps.

using System.Diagnostics;

public static class Guard
{
    [DebuggerStepThrough]
    public static void AgainstNull<T>(T? value, string paramName) where T : class
    {
        if (value is null)
            throw new ArgumentNullException(paramName);
    }
}

Usage:

Guard.AgainstNull(request, nameof(request));
Guard.AgainstNull(request.CustomerId, nameof(request.CustomerId));

When stepping through code, the debugger will typically skip over that guard implementation, which keeps focus on the business flow instead of generic plumbing.

This is most useful for:

• guard clauses
• mapping helpers
• simple validation helpers
• repeated infrastructure code that almost never needs line-by-line inspection

Do not overuse it. If a method is part of the likely failure path, you usually still want to be able to step into it naturally.

Practical guidance

Debugger attributes are best used to improve signal, not to decorate everything.

Good uses:

• domain entities where one or two fields identify the object clearly
• wrapper objects around collections or results
• stable helper methods that add stepping noise

Poor uses:

• hiding state that developers genuinely need during troubleshooting
• masking expensive or surprising logic behind a neat debugger view
• adding debugger metadata everywhere without a clear debugging pain point

The rule is simple: optimize the debugger for the questions you repeatedly ask when diagnosing a problem.

Summary

Debugger attributes in .NET improve the debugging experience without changing application behavior.

• use DebuggerDisplayAttribute to make objects readable at a glance
• use DebuggerBrowsableAttribute to hide or flatten low-value members
• use DebuggerStepThroughAttribute to reduce stepping noise in plumbing code

There is no separate NuGet package to install for this. These attributes are part of System.Diagnostics, so the examples work directly with modern .NET, including .NET 10.

If your objects are technically correct but annoying to inspect, debugger attributes are often the cleanest fix.

References

• Microsoft Docs: Enhancing Debugging with the Debugger Display Attributes
• Microsoft Docs: DebuggerDisplayAttribute
• Microsoft Docs: DebuggerBrowsableAttribute
• Microsoft Docs: DebuggerStepThroughAttribute