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xUnit1017 v2 v3 Error

MemberData must reference a static member

Cause

This rule is triggered when your [MemberData] attribute points to a non-static member.

Reason for rule

[MemberData] attributes may only point at static members, or else they will fail at runtime.

How to fix violations

To fix a violation of this rule, make the data member static.

Examples

Violates

using System.Collections.Generic;
using Xunit;

public class xUnit1017
{
    public IEnumerable<object[]> TestData;

    [Theory]
    [MemberData(nameof(TestData))]
    public void TestMethod(string greeting, int age) { }
}

Does not violate

using System.Collections.Generic;
using Xunit;

public class xUnit1017
{
    public static IEnumerable<object[]> TestData;

    [Theory]
    [MemberData(nameof(TestData))]
    public void TestMethod(string greeting, int age) { }
}