以下是一个示例的实现代码，用于模拟web表单提交，解析返回的json数据，并在DataGridView中展示数据：
```csharp
using System;
using System.Collections.Generic;
using System.Net;
using System.Net.Http;
using System.Windows.Forms;
using Newtonsoft.Json;
namespace WebFormSimulation
{
public partial class MainForm : Form
{
public MainForm()
{
InitializeComponent();
}
private async void btnSubmit_Click(object sender, EventArgs e)
{
// 构造要提交的表单数据
var formData = new Dictionary<string, string>
{
{ "username", "testuser" },
{ "password", "testpassword" }
};
try
{
// 使用HttpClient发送POST请求
using (var httpClient = new HttpClient())
{
var httpResponse = await httpClient.PostAsync("https://example.com/submit", new FormUrlEncodedContent(formData));
if (httpResponse.StatusCode == HttpStatusCode.OK)
{
var responseContent = await httpResponse.Content.ReadAsStringAsync();
// 解析返回的JSON数据
var responseData = JsonConvert.DeserializeObject<List<DataItem>>(responseContent);
// 清空DataGridView的数据
dataGridView.Rows.Clear();
// 在DataGridView中展示数据
foreach (var item in responseData)
{
dataGridView.Rows.Add(item.Property1, item.Property2, item.Property3);
}
}
else
{
MessageBox.Show("请求失败！");
}
}
}
catch (Exception ex)
{
MessageBox.Show("发生错误：" + ex.Message);
}
}
}
public class DataItem
{
public string Property1 { get; set; }
public string Property2 { get; set; }
public string Property3 { get; set; }
}
}
```
请注意替换实际的表单提交URL和表单数据，以及根据实际的JSON数据结构修改`DataItem`类的属性。
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