c# winforms，在搜索函数中使用async和await

using System;
using System.Net.Http;
using System.Threading.Tasks;
using System.Windows.Forms;

public partial class MainForm : Form
{
    public MainForm()
    {
        InitializeComponent();
    }

    private async void SearchButton_Click(object sender, EventArgs e)
    {
        string query = SearchTextBox.Text;
        string result = await SearchAsync(query);
        ResultTextBox.Text = result;
    }

    private async Task<string> SearchAsync(string query)
    {
        using (HttpClient client = new HttpClient())
        {
            string url = $"https://api.example.com/search?q={query}";
            HttpResponseMessage response = await client.GetAsync(url);
            response.EnsureSuccessStatusCode();
            string responseBody = await response.Content.ReadAsStringAsync();
            return responseBody;
        }
    }
}

private async void SearchButton_Click(object sender, EventArgs e)
{
    string query = SearchTextBox.Text;
    string result = await SearchAsync(query);
    this.Invoke((MethodInvoker)delegate
    {
        ResultTextBox.Text = result;
    });
}

private readonly SynchronizationContext _uiContext;

public MainForm()
{
    InitializeComponent();
    _uiContext = SynchronizationContext.Current;
}

private async void SearchButton_Click(object sender, EventArgs e)
{
    string query = SearchTextBox.Text;
    string result = await SearchAsync(query);
    _uiContext.Post(_ => ResultTextBox.Text = result, null);
}