C# 学习笔记

.Net

Build

• dotnet new
  • dotnet new –list 查看所有已安装模板的列表
  • dotnet new console -o projectName
  • dotnet new console -n projectName
  • dotnet new console –language “F#” //“C#” “F#”
  • https://docs.microsoft.com/zh-cn/dotnet/core/tools/dotnet-new
• dotnet run
• dotnet publish
• dotnet build
• dotnet clean
• dotnet exec
  • dotnet exec myapp.dll
  • dotnet myapp.dll
• dotnet pack
• https://docs.microsoft.com/zh-cn/dotnet/core/tools/dotnet
• dotnet sln
  • dotnet new sln -n slnName
  • dotnet sln xxx.sln add xxx\xxx.csproj //cmd
  • dotnet sln xxx.sln add **/*.csproj //bash
  • Intro to VSCode for C# Developers - From Installation to Debugging

C++ | DLL

• https://docs.microsoft.com/en-us/dotnet/api/system.runtime.interopservices.dllimportattribute?view=net-6.0

  using System.Runtime.InteropServices;
  [DllImport(@"..\..\xxx.dll",EntryPoint="Add",CallingConvention=CallingConvention.Cdecl)]
  public static extern int Add(int a,int b);

• DLL Edit
  • VS_xxx Prompt.bat
  • ildasm //查看
  • ILSpy //反编译

C#基础

get set

public string Name
{
    get { return name; }
　  set { name = value; }
}

Nullable

• int? i = null;
• int j = i ?? 0; //i为空，则返回0

Property || Field

• 属性是方法，应当暴露
• 字段是数据，应当被封装

Reflection

• Type
  • typeof(class)
• Attribute
  • type.GetCustomAttributes()
  • AttributeUsage 预定义特性
    • AttributeTargets
      • Class
      • Constructor
      • Field
      • Method
      • Property
    • AllowMultiple
  • Conditional
  • Obsolete

Bitwise | 位运算

• https://www.cnblogs.com/darrenji/p/3921183.html
• https://learn.microsoft.com/zh-cn/dotnet/csharp/language-reference/operators/bitwise-and-shift-operators
• | 位或操作符
• & 位与操作符
• ~ 取反操作符
• ^ 位异或操作符
  • 当两对应的二进位相异时，结果为1
  • 交换性
    • r = x ^ y
    • x = r ^ y
    • y = r ^ x
    • x、y交换
      • x ^= y;
      • y ^= x;
      • x ^= y;
      • 三次操作后，x、y已交换
• 加密、解密

  string msg = "这是我要加密的string字符串";
  string k = "mypassword";
  for(int i = 0; i < msg.Length; i++)
  {
      sb.Append((char)(msg[i] ^ k[i % k.Length]));
  }
  Console.WriteLine(sb.ToString());