string = alias(String)
来源:互联网 发布:excel2010没有数据分析 编辑:程序博客网 时间:2024/05/23 01:15
1.String和string再c#中的有什么不同?
2.datatype alias
1.String和string再c#中的有什么不同?
As others have noted, Apart from In the spec, the value type aliases are known as "simple types". Literals can be used for constant values of every simple type; no other value types have literal forms available. (Compare this with VB, which allows There is one circumstance in which you have to use the aliases: when explicitly specifying an enum's underlying type. For instance: Finally, when it comes to which to use: personally I use the aliases everywhere for the implementation, but the CLR type for any APIs. It really doesn't matter too much which you use in terms of implementation - consistency among your team is nice, but no-one else is going to care. On the other hand, it's genuinely important that if you refer to a type in an API, you do so in a language neutral way. A method called "ReadInt32" is unambiguous, whereas a method called "ReadInt" requires interpretation. The caller could be using a language which defines an "int" alias for Int16, for example. The .NET framework designers have followed this pattern, good examples being in the BitConverter, BinaryReader and Convert classes.string
is an alias for System.String
. They compile to the same code, so at execution time there is no difference whatsoever. This is just one of the aliases in C#. The complete list is:string
, object
, the aliases are all to value types. decimal
is a value type, but not a primitive type in the CLR. The only primitive type which doesn't have an alias is System.IntPtr
.DateTime
literals, and has an alias for it too.)public enum Foo : UInt32 {} // Invalid
public enum Bar : uint {} // Valid
2.datatype alias
//C#:using MyType = System.Int32; //define alias MyType for System.Int32//Now we can use the alias MyType anywhere in our code instead of actual System.In32 like belowMyType myNumber=12; Console.WriteLine(myNumber.ToString());
//If we want to change to System.Int64, We will simply change the alias, that’s it.using MyType = System.Int64;
- string = alias(String)
- DetachedCriteria的createCriteria(String associationPath,String alias)方法有bug
- string
- String
- String
- string
- string
- String
- string
- String
- string
- string
- string
- string
- String
- String
- string
- string +
- JAVA md5 加密
- nExcel数据表格中如何按条件显示
- 基站定位之GeolocationAPI接口
- 振动开关和水银开关的区别
- Excel数据表格中如何将姓名信息
- string = alias(String)
- 收藏 Leach协议学习(3)——Leach协议分析
- 滚珠开关相关知识
- Excel数据表格中如何利用“高级
- Excel数据格式设置
- Excel数据排序操作
- Excel数据输入范围控制
- EXCEL选项设置加密
- Excel页面背景设置