public static Expression GetExpression <T>(ParameterExpression param, ExpressionFilter filter, Type propertyType)
{
MemberExpression member = Expression.Property(param, filter.ActualPropertyName);
ConstantExpression constant = Expression.Constant(filter.ActualValue, propertyType);
string s = string.Empty;
switch (filter.Comparison)
{
case ComparisonOperator.Equal:
return(Expression.Equal(member, constant));
case ComparisonOperator.GreaterThan:
return(Expression.GreaterThan(member, constant));
case ComparisonOperator.GreaterThanOrEqual:
return(Expression.GreaterThanOrEqual(member, constant));
case ComparisonOperator.LessThan:
return(Expression.LessThan(member, constant));
case ComparisonOperator.LessThanOrEqual:
return(Expression.LessThanOrEqual(member, constant));
case ComparisonOperator.NotEqual:
return(Expression.NotEqual(member, constant));
case ComparisonOperator.Contains:
return(Expression.Call(ToLowerMember(member), containsMethod, constant));
case ComparisonOperator.StartsWith:
return(Expression.Call(member, startsWithMethod, constant));
case ComparisonOperator.EndsWith:
return(Expression.Call(member, endsWithMethod, constant));
case ComparisonOperator.In:
return(constant.ListContains(member));
default:
return(null);
}
}
