using system;
using system.linq.expressions;
using system.reflection;
namespace helper
///
/// 建立lambda表示式：p=>false
///
///
///
public static expression> false()
///
/// 建立lambda表示式：p=>p.propertyname
///
///
///
///
///
public static expression> getorderexpression(string propertyname)
///
/// 建立lambda表示式：p=>p.propertyname == propertyvalue
///
///
///
///
///
public static expression> createequal(string propertyname, string propertyvalue)
///
/// 建立lambda表示式：p=>p.propertyname != propertyvalue
///
///
///
///
///
public static expression> createnotequal(string propertyname, string propertyvalue)
///
/// 建立lambda表示式：p=>p.propertyname > propertyvalue
///
///
///
///
///
public static expression> creategreaterthan(string propertyname, string propertyvalue)
///
/// 建立lambda表示式：p=>p.propertyname < propertyvalue
///
///
///
///
///
public static expression> createlessthan(string propertyname, string propertyvalue)
///
/// 建立lambda表示式：p=>p.propertyname >= propertyvalue
///
///
///
///
///
public static expression> creategreaterthanorequal(string propertyname, string propertyvalue)
///
/// 建立lambda表示式：p=>p.propertyname <= propertyvalue
///
///
///
///
///
public static expression> createlessthanorequal(string propertyname, string propertyvalue)
///
/// 建立lambda表示式：p=>p.propertyname.contains(propertyvalue)
///
///
///
///
///
private static expression> getcontains(string propertyname, string propertyvalue)
);constantexpression constant = expression.constant(propertyvalue, typeof(string));
return expression.lambda>(expression.call(member, method, constant), parameter);
}///
/// 建立lambda表示式：!(p=>p.propertyname.contains(propertyvalue))
///
///
///
///
///
private static expression> getnotcontains(string propertyname, string propertyvalue)
);constantexpression constant = expression.constant(propertyvalue, typeof(string));
return expression.lambda>(expression.not(expression.call(member, method, constant)), parameter);}}
}
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