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# 混合使用多语言并共享变量
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混合使用多种语言(C#、F#、Powershell、SQL、KQL、Python、Html、JavaScript、JavaScript、Mermaind等语言)，是多语言笔记的最大特性，并且支持各语言之间共享变量这一创新功能。
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## 语言及共享变量的支持情况
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| 语言 | 变量共享 |
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| ---- | ---- |
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| C# | 支持 |
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| F# | 支持 |
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| PowerShell | 支持 |
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| JavaScript | 支持 |
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| SQL | 支持 |
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| KQL | 支持 |
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| Python | 支持 |
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| R | 支持 |
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| HTML | 不支持 |
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| Mermaid | 不支持 |
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## 初始化
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```C#
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//全局初始化
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#!import "./Base.ipynb"
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//共享
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using Microsoft.DotNet.Interactive;
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using Microsoft.DotNet.Interactive.Commands;
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```
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## 使用 SQL(SQLite为例)
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+ 引用NuGet包
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```C#
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#r "nuget:Microsoft.DotNet.Interactive.SQLite,*-*"
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```
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+ 连接 SQL内核(使用 `#!connect` 魔法命令)
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```C#
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/* 简单使用
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#!connect sqlite --kernel-name SQLiteSharedKernel --connection-string "Data Source=.\assets\database\study.db;"
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*/
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//优化方法
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using Microsoft.DotNet.Interactive;
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using Microsoft.DotNet.Interactive.Commands;
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{
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//内核名：魔法命令中的内核名，执行后会自动加 sql- 前缀，做为内核名被使用
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string magicCommandKernelName = "SQLiteSharedKernel";
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string completeKernelName = "sql-" + magicCommandKernelName;
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//引入内核：可重复执行
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if(Microsoft.DotNet.Interactive.Kernel.Root.FindKernelByName(completeKernelName) == null)
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{
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var connectKernelCode = $"#!connect sqlite --kernel-name {magicCommandKernelName} --connection-string \"{SharedDbConnect.SQLiteConnectionString}\"";
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await Kernel.Root.SendAsync(new SubmitCode( connectKernelCode, "csharp"));
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}
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else
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{
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Console.WriteLine($"名为 {completeKernelName} 的内核已存在。需要新内核时，请为--kernel-name参数使用不同的值, 本次执行不做任何更改！");
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}
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}
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```
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+ 使用SQL内核(SQL语句操作数据库)
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```C#
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#!sql-SQLiteSharedKernel
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--查询年龄最大的5名学生
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SELECT * FROM Student order by Age Desc LIMIT 5;
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--查询学生总数
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SELECT COUNT(*) AS Count FROM Student;
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```
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## 使用 KQL(效果图)
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因为环境比较难搭建，用效果图代替。
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## 使用 Raw Value Storage
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使用value内核，可以方便的管理共享文本数据。
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```C#
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#!value --name SharedDataFromValueKernel --from-file ./shared/file/data.json
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```
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## C#
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### 一般使用
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```C#
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var student = new {Id=1, Name="张三",Age=18};
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student.Display();
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```
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### 使用Value内核共享的变量
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```C#
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#!set --name fromSharedFileData --value @value:SharedDataFromValueKernel
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fromSharedFileData.Display();
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```
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### 共享变量
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使用C#查询数据库中的数据，共享出来，给其它语言(F#、html、js等使用)
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```C#
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#r "nuget:Microsoft.Data.SqlClient"
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#r "nuget:Microsoft.Data.Sqlite"
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using System.Data;
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using System.Data.Common;
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using System.Data.SqlTypes;
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using Microsoft.Data.SqlClient;
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using Microsoft.Data.Sqlite;
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//使用 Ado.Net 从SQLite中获取数据，再共享出去
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//查询数据
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var SharedStudents = new List<Student>();
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{
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DataSet ds = new DataSet();
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using(var sqlConnection = new SqliteConnection(SharedDbConnect.SQLiteConnectionString))
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{
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sqlConnection.Open();
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var querySql =
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"""
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SELECT * FROM Student LIMIT 5;
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""";
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var cmd = sqlConnection.CreateCommand();
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cmd.CommandType = CommandType.Text;
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cmd.CommandText = querySql;
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using (var reader = await cmd.ExecuteReaderAsync())
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{
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//循环输出行数据
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while (await reader.ReadAsync())
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{
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var user = new Student()
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{
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Id = reader.GetFieldValue<int>("Id"),
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Name = reader.GetFieldValue<string>("Name"),
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Age = reader.GetFieldValue<int>("Age"),
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};
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SharedStudents.Add(user);
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}
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}
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sqlConnection.Close();
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sqlConnection.Dispose();
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}
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}
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//共享数据:默认SharedStudents已共享，其它语言引用即可
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SharedStudents.Display();
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```
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## F#
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### 简单示例
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```C#
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printfn "Hello World from F#"
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```
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### 使用C#共享数据
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```C#
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#!set --value @csharp:SharedStudents --name SharedStudents
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SharedStudents
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```
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## Powershell
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```C#
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#!powershell
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Write-Host "hellow powershell"
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```
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## 使用Python
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+ 前提：系统要安装Python环境，推荐使用Anaconda安装，直接安装Python也可以
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+ 作用：使多语言笔记，直接支持 Python语言；
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+ 连接到 Python 内核
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```C#
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using Microsoft.DotNet.Interactive;
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using Microsoft.DotNet.Interactive.Commands;
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//引入Python内核：使用C# 执行引入语句
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if(Kernel.Root.FindKernelByName("pythonkernel2") == null)
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{
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//Console.WriteLine("正在导入Python内核....");
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var importPythonkernel = "#!connect jupyter --kernel-name pythonkernel2 --kernel-spec python3";
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await Kernel.Root.SendAsync(new SubmitCode( importPythonkernel, "csharp"));
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Console.WriteLine("Python内核导入完成");
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}
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else
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{
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Console.WriteLine("Python内核已经导入");
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}
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```
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+ 使用 Python
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```C#
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# 明确指定内核：优先级高于 "单元格选择的内核"
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#!pythonkernel2
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#!set --value @csharp:SharedStudents --name SharedStudents
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print("你好，我是 Ployglot Notebooks 使用 Python语言内核，打印的内容！")
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```
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## 在 Python 中使用C#共享变量
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```C#
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#!pythonkernel2
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#!set --value @csharp:SharedStudents --name SharedStudents
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print(SharedStudents)
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```
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## 使用 html
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```C#
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<!DOCTYPE html>
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<html lang="zh-CN">
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<head>
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<meta charset="UTF-8">
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<meta http-equiv="X-UA-Compatible" content="IE=edge">
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<meta name="viewport" content="width=device-width, initial-scale=1.0">
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<title>完整html文档</title>
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</head>
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<body>
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<div style="color:green">
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<h2 id="MyTitle">使用Html文档，当然也可以使用Html片断。注意：纯HTML不支持共享变量！</h2>
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<table id="student" border="1" style="color:#fff">
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<caption>C#共享数据：学生表</caption>
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<thead>
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<tr>
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<th>编号</th>
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<th>姓名</th>
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<th>年龄</th>
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</tr>
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</thead>
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<tbody>
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</tbody>
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</table>
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</div>
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</body>
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</html>
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```
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## 使用 JavaScript
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+ 简单使用
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```C#
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console.log("输出js日志");
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```
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+ 操作html
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```C#
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//改变上面html中h2文本颜色：执行后上面看效果
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document.getElementById("MyTitle").style.color = "red";
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```
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+ 使用C#共享数据，填充数据表格
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```C#
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#!set --value @csharp:SharedStudents --name SharedStudentsInJs
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// 获取表格的tbody部分
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const tableBody = document.querySelector('#student tbody');
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// 遍历数据数组
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SharedStudentsInJs.forEach(item => {
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// 创建一行
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const row = document.createElement('tr');
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// 创建单元格并填入数据
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const nameCell = document.createElement('td');
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nameCell.textContent = item.Id;
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row.appendChild(nameCell);
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const ageCell = document.createElement('td');
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ageCell.textContent = item.Name;
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row.appendChild(ageCell);
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const jobCell = document.createElement('td');
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jobCell.textContent = item.Age;
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row.appendChild(jobCell);
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// 将该行添加到表格的tbody中
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tableBody.appendChild(row);
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});
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```
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## HTTP Request
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## 基本请求
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```C#
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### 请求 京东
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get https://www.jd.com
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### 请求QQ
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get https://www.qq.com
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```
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+ 高级请求(使用变量等)
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```C#
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@host=https://www.qq.com
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get {{host}}
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```
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## 使用 mermaind
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```C#
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stateDiagram-v2
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[*] --> Active
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state Active {
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[*] --> NumLockOff
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NumLockOff --> NumLockOn : EvNumLockPressed
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NumLockOn --> NumLockOff : EvNumLockPressed
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--
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[*] --> CapsLockOff
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CapsLockOff --> CapsLockOn : EvCapsLockPressed
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CapsLockOn --> CapsLockOff : EvCapsLockPressed
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--
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[*] --> ScrollLockOff
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ScrollLockOff --> ScrollLockOn : EvScrollLockPressed
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ScrollLockOn --> ScrollLockOff : EvScrollLockPressed
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}
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```
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```C#
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stateDiagram-v2
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state fork_state <<fork>>
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[*] --> fork_state
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fork_state --> State2
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fork_state --> State3
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state join_state <<join>>
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State2 --> join_state
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State3 --> join_state
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join_state --> State4
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State4 --> [*]
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```
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