internal static T GetValueFromEqualsExpression <T>(BinaryExpression be, Type memberDeclaringType, string memberName)
{
if (!ValuableNodeTypes.HasFlag(be.NodeType))
{
throw new Exception("There is a bug in this program.");
}
if (be.Left.NodeType == ExpressionType.MemberAccess)
{
MemberExpression me = (MemberExpression)be.Left;
if (me.Member.DeclaringType == memberDeclaringType && me.Member.Name == memberName)
{
return(GetValueFromExpression <T>(be.Right));
}
}
else if (be.Right.NodeType == ExpressionType.MemberAccess)
{
MemberExpression me = (MemberExpression)be.Right;
if (me.Member.DeclaringType == memberDeclaringType && me.Member.Name == memberName)
{
return(GetValueFromExpression <T>(be.Left));
}
}
else if (be.Right.NodeType == ExpressionType.Constant)
{
var ce = (ConstantExpression)be.Right;
return((T)ce.Value);
}
// We should have returned by now.
//throw new Exception("There is a bug in this program.");
return(default(T));
}
public static bool Matches(ExpressionType expressionType, Type type)
{
if (type == typeof(int) || type == typeof(double) || type == typeof(decimal))
{
return(expressionType.HasFlag(ExpressionType.number));
}
if (type == typeof(string))
{
return(expressionType.HasFlag(ExpressionType.text));
}
if (type == typeof(bool))
{
return(expressionType.HasFlag(ExpressionType.boolean));
}
if (type.IsEnum)
{
return(expressionType.HasFlag(ExpressionType.@enum));
}
return(false);
}