以下是 VB.NET 中使用 System.Threading 命名空间启动 10 个线程并调用函数的示例代码:Imports System.Threading Public Class Form1 Private Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click ' 创建一个包含 10 个线程的 Thread 数组 Dim threads(9) As Thread For i As Integer = 0 To 9 threads(i) = New Thread(AddressOf DoWork) threads(i).Start(i) Next End Sub Private Sub DoWork(ByVal data As Object) Dim id As Integer = CType(data, Integer)
其实还有其它的方法来延迟过程,并不卡死窗体。' 导入 Threading 命名空间 Imports System.Threading Public Class Form1 ' 创建延迟函数 Public Async Function Delay(ByVal milliseconds As Integer) As Task Await Task.Delay(milliseconds) End Function ' 使用示例 Private Async Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click For i = 0 To 10 ListBox1.Items.Add(i) Await Delay(3000) ' 延迟 3 秒 Next End Sub End Class
下面是 VB.NET 中使用 HttpClient 类进行 GET 请求的示例代码:Imports System.Net.Http Public Class Form1 Private Async Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click ' 创建一个 HttpClient 对象实例 Using client As New HttpClient() ' 向指定 URL 发送 GET 请求,并等待响应 Dim response As HttpResponseMessage = Await client.GetAsync("https://example.com") ' 检查是否成功,如果成功则读取响应内容 If response.IsSuccessStatusCode Then Dim c
Imports System.Runtime.InteropServices Imports System.Text Module Module1 '定义HOOKPROC委托 Private Delegate Function HookProc(ByVal nCode As Integer, ByVal wParam As IntPtr, ByVal lParam As IntPtr) As Integer '定义Win32 API函数 <DllImport("User32.dll", SetLastError:=True)> Private Function SetWindowsHookEx(ByVal idHook As Integer, ByVal lpfn As HookProc, ByVal hInstance As IntPtr, ByVal threadId As UInteger) As IntPtr End Function <DllImport("User3
在 VB.NET 的 HttpClient 类中,您可以通过设置 HTTP 请求的 Content-Type 标头来指定请求正文的编码方式。下面是一个例子:Imports System.Net.Http Imports System.Text Public Class Form1 Private Async Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click Using client As New HttpClient() ' 创建一个 StringContent 对象,并将其编码方式设置为 UTF-8 Dim content As New StringContent("Hello, world!", Encoding.UTF8, "text/plain") Dim response As HttpResponseMessage = Await cl
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