[C#]語法混合應用

一些C# 的基礎應用範例

 int iData = 123;

string str = $"Hello{iData}!!";

Action<string> greet = name =>

{

    string greeting = $"hello {name}!";

    Console.WriteLine(greeting);

};

greet("world");

其他執行續範例說明:

正常寫法如以下兩段:

private void setText(Object str) { using (StreamWriter sw = new StreamWriter(@"D:\test.txt",true,Encoding.UTF8)) { sw.WriteLine(str.ToString()); } } protected void Button1_Click(object sender, EventArgs e) { string str = "測試四"; ThreadPool.QueueUserWorkItem(new WaitCallback(setText),(Object) str); }

透握委派方式簡化程式碼:

protected void Button1_Click(object sender, EventArgs e) { string str = "測試三"; ThreadPool.QueueUserWorkItem(delegate { using (StreamWriter sw = new StreamWriter(@"D:\test.txt", true, Encoding.UTF8)); //路徑 , 不複寫檔案 , 編碼 { sw.WriteLine(str); } }); }

透過Lambda寫法:

protected void Button1_Click(object sender, EventArgs e) { string str = "測試五"; ThreadPool.QueueUserWorkItem(callback => { using (StreamWriter sw = new StreamWriter(@"D:\test.txt", true, Encoding.UTF8)) { sw.WriteLine(str.ToString()); } }); }

參考來源:

https://learn.microsoft.com/zh-tw/dotnet/csharp/language-reference/operators/lambda-expressions

https://dotblogs.com.tw/ken74114/2010/12/08/19988