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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