早些时候我收到错误:
Feature 'range operator' is not available in C# 7.3. Please use language version 8.0 or greater.
当我升级项目时,仍然存在以下错误:
Predefined type 'System.Range' is not defined or imported
基本上尝试测试我们如何检索数组或字符串的片段:
using System;
using System.Windows.Forms;
namespace TestRange
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
private void button1_Click(object sender, EventArgs e)
{
var story = "Testing C# 8";
Console.WriteLine(story[^6..^0]); // (last 6 chars)
}
}
}
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我参考过但没有帮助的文章:
https://learn.microsoft.com/en-us/dotnet/api/system.range?view=netcore-3.1 https://learn.microsoft.com/en-us/dotnet/csharp/language-reference/proposals /csharp-8.0/ranges https://learn.microsoft.com/en-us/dotnet/csharp/tutorials/ranges-indexes
https://www.infoworld.com/article/3532284/how-to-use-indices-and-ranges-in-csharp-80.html
https://www.codejourney.net/2019/02/csharp-8-slicing-indexes-ranges/
一个相关问题:C# 中的数组切片
我已经尝试了这个答案中提到的代码:https : //stackoverflow.com/a/27089652/
它工作正常,我想用它在 for 循环中运行 PowerShell 脚本。GUI最初冻结然后我尝试了这个答案中提到的代码:https : //stackoverflow.com/a/35735760/
现在,当 PowerShell 脚本在后台运行时,GUI 不会冻结,尽管在 for 循环完成之前文本框中没有任何更新。我想看到实时更新的结果。这是我正在运行的代码:
private async void run_click(object sender, RoutedEventArgs e)
{
Text1.Text = "";
await Task.Run(() => PS_Execution(Text1));
}
internal async Task PS_Execution(TextBox text)
{
PowerShell ps = PowerShell.Create();
ps.AddScript(script.ToString());
{
Collection<PSObject> results = ps.Invoke();
foreach (PSObject r in results)
{
text.Dispatcher.Invoke(() =>
{
text.Text += r.ToString();
});
await Task.Delay(100);
}
}
}
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也许我错过了一些重要的东西。请帮助我了解如何解决这个问题。