dotnet/BenchmarkDotNet · error · InvalidOperationException

Type {0}: no property or field {1} found.

Error message

Type {0}: no property or field {1} found.

What it means

InProcessNoEmitRunner reflects over the target type to locate a property or field by name; no matching member was found.

Source

Thrown at src/BenchmarkDotNet/Toolchains/InProcess/NoEmit/InProcessNoEmitRunner.cs:87

        /// <param name="benchmarkCase">The benchmark.</param>
        /// <param name="cancellationToken">The cancellation token to inject into members marked with [BenchmarkCancellation].</param>
        internal static void FillMembers(object instance, BenchmarkCase benchmarkCase, CancellationToken cancellationToken)
        {
            var targetType = benchmarkCase.Descriptor.Type;

            // Fill parameter values
            foreach (var parameter in benchmarkCase.Parameters.Items)
            {
                var flags = BindingFlags.Public;
                flags |= parameter.IsStatic ? BindingFlags.Static : BindingFlags.Instance;

                var paramProperty = targetType.GetProperty(parameter.Name, flags);

                if (paramProperty == null)
                {
                    var paramField = targetType.GetField(parameter.Name, flags);
                    if (paramField == null)
                        throw new InvalidOperationException(
                            $"Type {targetType.FullName}: no property or field {parameter.Name} found.");

                    var callInstance = paramField.IsStatic ? null : instance;
                    paramField.SetValue(callInstance, parameter.Value);
                }
                else
                {
                    var setter = paramProperty.GetSetMethod();
                    if (setter == null)
                        throw new InvalidOperationException(
                            $"Type {targetType.FullName}: no settable property {parameter.Name} found.");

                    var callInstance = setter.IsStatic ? null : instance;
                    setter.Invoke(callInstance, [parameter.Value]);
                }
            }

            // Inject CancellationToken into properties/fields marked with [BenchmarkCancellation]

View on GitHub (pinned to b515068b61)

Solutions

1. Check the property/field name passed in the configuration for typos and correct casing.
2. Ensure the member exists on the benchmark instance type and is accessible (public, or accessible from the runner).
3. If the member was renamed or removed, update the configuration string accordingly.

When it happens

Trigger: Thrown at src/BenchmarkDotNet/Toolchains/InProcess/NoEmit/InProcessNoEmitRunner.cs:87 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of dotnet/BenchmarkDotNet@b515068b61 (2026-08-13). Data as JSON: /api/errors/e74a0f6e31f8ed9e. Report an issue: GitHub.