Would there be any performance difference between these 2 IEnumerable<T> codes using foreach?

var effects = this.EffectsRecursive;
foreach ( Effect effect in effects )
{
...
}

vs

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foreach ( Effect effect in this.EffectsRecursive )
{
...
}

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No, the foreach operates on the result of the call to IEnumerable.GetEnumerator, which will get called only once either way.