public PageQueryItem(
string name,
string value,
ExpressionOperate operate = ExpressionOperate.Equal,
IfBuild ifBuild = IfBuild.IsNotNullOrWhiteSpace)
{
Name = name;
Value = value;
Operate = operate;
IfBuild = ifBuild;
}
public static Expression Create(ParameterExpression exp1, string name, Type type, string value, ExpressionOperate operate)
{
switch (operate)
{
case ExpressionOperate.Equal:
return(CreateEqual(exp1, name, type, value));
case ExpressionOperate.Like:
if (!type.Equals(typeof(string)))
{
throw new ArgumentException("operate like 's type should be string!");
}
return(CreateLike(exp1, name, value));
case ExpressionOperate.Contains:
return(CreateContains(exp1, name, type, value));
case ExpressionOperate.IsNull:
return(CreateNull(exp1, name, type));
case ExpressionOperate.IsNotNull:
return(CreateNotNull(exp1, name, type));
default:
throw new NotSupportedException(operate.ToString());
}
}
public static Expression <Func <T, bool> > Create <T>(Expression <Func <T, bool> > predicate, string name, string value, ExpressionOperate operate, bool isAnd)
{
var right = Create(predicate.Parameters[0], name, typeof(T).GetProperty(name).PropertyType, value, operate);
return(Combine(predicate, right, isAnd));
}