private static bool IsComparison(Expression expression)
{
MethodCallExpression mce = expression as MethodCallExpression;
if (mce == null)
{
switch (expression.NodeType)
{
case ExpressionType.Equal:
case ExpressionType.LessThan:
case ExpressionType.LessThanOrEqual:
case ExpressionType.GreaterThan:
case ExpressionType.GreaterThanOrEqual:
case ExpressionType.NotEqual:
return(true);
default:
return(false);
}
}
ExpressionType ignored;
return(MethodCallConverter.GetVBObjectComparisonType(mce, out ignored));
}
protected override Expression VisitMethodCall(MethodCallExpression m)
{
if (m.Method.DeclaringType.FullName == "Microsoft.VisualBasic.CompilerServices.Operators" && m.Arguments.Count == 3)
{
ExpressionType comparisonType;
if (MethodCallConverter.GetVBObjectComparisonType(m, out comparisonType))
{
// Translate CompareObject[operator](x, y) to x [operator] y.
ReadOnlyCollection <Expression> args = this.Visit(m.Arguments);
return(Expression.MakeBinary(comparisonType, args[0], args[1]));
}
}
else if (m.Method.DeclaringType.FullName == "Microsoft.VisualBasic.Interaction" &&
m.Method.Name == "IIf" &&
m.Arguments.Count == 3)
{
// Translate VB's "iif(test, truePart, falsePart)" into "test ? truePart : falsePart".
ReadOnlyCollection <Expression> args = this.Visit(m.Arguments);
return(Expression.Condition(args[0], args[1], args[2]));
}
return(base.VisitMethodCall(m));
}