1234567char c1 = '\0';char c2 = Char.MinValue;char c3 = (char) 0;char c4 = Convert.ToChar(0);char c5 = ((char?) null).GetValueOrDefault();char c6 = default(char);Console.WriteLine("C...

声明对象1234567891011121314using System;using System.ComponentModel;using System.Reflection;[Description("用户")]public class User{ [Description("编号")] public int Id {...

自定义文本框123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354/// <summary>/// 自定义文本框/// 1.只能输入数值, 限制输入两位小数/// 2.禁止粘贴/// </summary>public clas...

1userList.ForEach(a => { a.Country = "China"; a.Currency = "RMB"; a.Area = "Asia"; });

判断文件名称是否有效 12345var fileName = @"D:\Source\*Http:Server?.cs";if (fileName.IndexOfAny(System.IO.Path.GetInvalidFileNameChars()) != -1){ Console.WriteLine("File name is invalid...

创建表的时候添加主键和自增长列12345678CREATE TABLE [dbo].[ThirdPro]( Id INT NOT NULL IDENTITY(1, 1) PRIMARY KEY , [ProID] UNIQUEIDENTIFIER NULL , [PartType] VARCHAR(500) NULL) 表已存在的情况下设置自增长列...

C# 声明枚举对象1234567891011public enum EnumFileCategory{ [Description("goods_files/pdf")] Pdf, PdfImg, [Description("My/image")] MyImg, [Description("My/v...

获取逻辑文件名和数据库名称 1restore filelistonly from disk = 'D:\DB\DB_OMINFO_backup_6633232.bak' 执行还原 12restore database DB_INFOS FROM disk = 'C:\DB\DB_OMINFO_backup_6633232.bak' with mov...

连接提示： 425 Can't open data connection for transfer of "/" 解决方法： 开放端口,不推荐.为了保障安全 调整客户端软件的模式:使用主动模式