/// <summary>访问子内容为： <see cref="T:System.Linq.Expressions.MemberAssignment"></see>.</summary>
/// <param name="node">被访问的表达式</param>
/// <returns>The modified expression, if it or any subexpression was modified; otherwise, returns the original expression.</returns>
protected override MemberAssignment VisitMemberAssignment(MemberAssignment node)
{
Log(node.ToString());
throw new NotImplementedException();
}
/// <summary>
/// Visits the children of the <see cref="System.Linq.Expressions.MemberAssignment"/>.
/// </summary>
/// <param name="node">The expression to visit.</param>
/// <returns>The modified expression, if it or any subexpression was modified; otherwise, returns the original expression.</returns>
protected override MemberAssignment VisitMemberAssignment(MemberAssignment node)
{
// a.b = c
InvalidExpression(node.ToString());
return(null);
}
