SpanQuery getfield method implementation

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C#

My spannearquery constructor is below:

public SpanNearQuery(SpanQuery[] spanQuery, int slop, bool inOrder)
{
    this.clauses = new System.Collections.ArrayList(spanQuery.Length);
    for (int i = 0; i < spanQuery.Length; i++)
    {
        SpanQuery clause = spanQuery[i];
        if (i == 0)
        {
            // check field
            field = clause.GetField();
        }
        else if (!clause.GetField().Equals(field))
        {
            throw new System.ArgumentException("Clauses must have same field.");
        }
        this.clauses.Add(clause);
    }

    this.Slop = slop;
    this.InOrder = inOrder;
}

In SpanNearQuery, GetField() is SpanQuery method. I dont know how to implement GetField() method in SpanQuery class.

Can you please help me anyone?

[edit]Code block added - OriginalGriff[/edit]