For context classes, there should be an overloaded base(options) constructor. public partial class DatabaseContext : DbContext { public DatabaseContext() { } public DatabaseContext(DbContextOptions<DatabaseContext> options) : base(options)[......…

对于上下文类，要有一个 base(options) 构造函数重载。 public partial class DatabaseContext : DbContext { public DatabaseContext() { } public DatabaseContext(DbContextOptions<DatabaseContext> options) : base(options) { } } 使用时 var opt[......]继续阅读

First, switch to the root user and then execute apt-get install software-properties-common Then the following prompts will appear: Reading package lists... Done Analyzing the dependency tree Reading state information... Done The following packages will be inst…

首先要切换到 root 用户，然后执行 apt-get install software-properties-common 然后会出现以下提示 正在读取软件包列表... 完成 正在分析软件包的依赖关系树 正在读取状态信息... 完成 将会同时安装下列软件： libappstream4 packagekit packagekit-tools python3-pycurl python3-software-properties 建议安装： appstream libcurl4-gnutls-dev python-py…

EF Core 查询中默认是跟踪查询。

EF Core 查询中默认是跟踪查询。

Value type Equals and == are equivalent; For string, after overriding, Equals and == are equivalent; For object type, the specificity of string; For other class types. object t = "123"; object a = t; object b = "123"; Console.WriteL[......]…

值类型 Equals 与 == 等同； string 经过重写， Equals 与 == 等同； object 类型，string 的特殊性； 其他类 类型。 object t = "123"; object a = t; object b = "123"; Console.WriteLine(a == b); Console.ReadKey(); object t = 1; object[......]继续阅读

// Set up client HttpClient client = new HttpClient(); client.DefaultRequestHeaders.Authorization = new System.Net.Http.Headers.AuthenticationHeaderValue ("Basic", Convert.ToBase64String(Encoding.UTF8.GetBytes($"{user}:{[......]继续阅读

// 设置 client HttpClient client = new HttpClient(); client.DefaultRequestHeaders.Authorization = new System.Net.Http.Headers.AuthenticationHeaderValue ("Basic", Convert.ToBase64String(Encoding.UTF8.GetBytes($"{user}:{pass[......]继续阅读

dpkg-reconfigure tzdata is a command used in Debian-based Linux distributions to reconfigure the time zone data. When executed, it allows the user to select the desired time zone from a list of available time zones. This command updates the system's time zone …

dpkg-reconfigure tzdata [......] 继续阅读

Create a swap partition bs: size count: quantity sudo dd if=/dev/zero of=/swapfile bs=64M count=16 sudo mkswap /swapfile sudo swapon /swapfile Remove the swap partition after use sudo swapoff /swapfile sudo rm /swapfile [......] 继续阅读

创建交换分区 bs:大小 count：数量 sudo dd if=/dev/zero of=/swapfile bs=64M count=16 sudo mkswap /swapfile sudo swapon /swapfile 用完后删除交换分区 sudo swapoff /swapfile sudo rm /swapfile [......] 继续阅读

https://blog.csdn.net/y353027520dx/article/details/88872643 [......] 继续阅读

https://blog.csdn.net/y353027520dx/article/details/88872643 [......] 继续阅读

Common Value Types Value type variables can be directly assigned a value. They are derived from the class System.ValueType. | Type | Description | Range | Default Value | | :------ | :-----------------------------------[......] 继续阅读

常用值类型（Value types） 值类型变量可以直接分配给一个值。它们是从类 System.ValueType 中派生的。 类型 描述 范围 默认值 bool 布尔值 True 或 False False byte 8 位无符号整数 0 到 255 0 char 16 位 Unicode 字符 U +0000 到 U +ffff '\0' decimal 128 位精确的十进制值，28-29 有效位数 (-7.9 x 1028 到 7.9 x 1028) / 100 到 28 0.0M double 64 位双…

public class MyClass { public async Task<int> GetIntAsync() { await Task.FromResult(GetInt()); return 1; } public int GetInt() { return 1; } } [......] 继续阅读

public class MyClass { public async Task<int> GetIntAsync() { await Task.FromResult(GetInt()); return 1; } public int GetInt() { return 1; } } [......] 继续阅读