v2 v3   Error

xUnit9011

"Theory parameter cannot use params modifier"

Cause

A violation of this rule occurs when a theory parameter uses the params modifier.

Reason for rule

When using the reflection-based version of xUnit.net, it will attempt to examine your data values at runtime and dynamically construct the params array on your behalf. This requires reflection features that are not available in Native AOT.

How to fix violations

To fix a violation of this rule, remove the params modifier on the parameter, and update your theory data to create the array yourself.

Examples

Violates

using Xunit;

public class xUnit9011
{
    [Theory]
    [InlineData("Hello world", 42)]
    [InlineData("Hello world", 2112, 2600)]
    public void TheoryMethod(string greeting, params int[] values)
    { }
}

Does not violate

using Xunit;

public class xUnit9011
{
    [Theory]
    [InlineData("Hello world", new[] { 42 })]
    [InlineData("Hello world", new[] { 2112, 2600 })]
    public void TheoryMethod(string greeting, int[] values)
    { }
}