C# Body为form-data file文件上传至第三方接口-编程知识

C# Body为form-data file文件上传至第三方接口

news/2024/11/16 3:27:36/文章来源:https://www.cnblogs.com/zengzhanping/p/18201829

1.首先，让我们看一下第三方API接口在Postman工具中的展示：

请求方式：POST
请求URL：http://192.168.100.246:30011/sino-qc/product/inspect/ocr-name
请求Header：Content-Type: multipart/form-data
请求Body：file（类型为file）

2.现在，让我们编写C#代码来实现文件上传功能。我们可以使用 HttpClient 类来发送HTTP请求，并通过 MultipartFormDataContent 类来构建上传文件的form-data格式。以下是完整的C#代码示例：

using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Net;
using System.Net.Http;
using System.Net.Http.Headers;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using Newtonsoft.Json;
using Newtonsoft.Json.Linq;
using SinocareFileUploadWinForms.Utillity;namespace SinocareFileUploadWinForms
{public partial class MainForm : Form{private const string ApiUrl = "http://192.168.100.246:31861/product/inspect/ocr-name";//private string ApiUrl = Utillity.HttpRequestHelper.GetSinocareFileUploadUrl();public MainForm(){InitializeComponent();}private async void UploadButton_Click(object sender, EventArgs e){#region MyRegionOpenFileDialog dialog = new OpenFileDialog();dialog.Multiselect = true; // 允许多选文件dialog.Filter = "PDF Files (*.pdf)|*.pdf|All Files (*.*)|*.*";dialog.Title = "Select PDF Files";if (dialog.ShowDialog() == DialogResult.OK){var httpClient = new HttpClient();var content = new MultipartFormDataContent();content.Headers.ContentType.CharSet = "utf-8"; //设置字符集foreach (var filePath in dialog.FileNames){var fileStream = new FileStream(filePath, FileMode.Open);var fileContent = new StreamContent(fileStream);content.Add(fileContent, "files", Path.GetFileName(filePath));}try{var response = httpClient.PostAsync(ApiUrl, content);response.Wait();//等待请求结果if (response.Result.IsSuccessStatusCode){var jsonString = response.Result.Content.ReadAsStringAsync().Result;var jsonData = JObject.Parse(jsonString);var renameInstructions = jsonData["data"] as JArray;if (renameInstructions != null){foreach (var item in renameInstructions){var originalName = item["orginName"].ToString();var newName = item["newName"].ToString();var originalPath = dialog.FileNames.FirstOrDefault(path => Path.GetFileName(path) == originalName);if (originalPath != null){var directoryPath = Path.GetDirectoryName(originalPath);var newPath = Path.Combine(directoryPath, newName);try{File.Move(originalPath, newPath); // 尝试重命名文件MessageBox.Show($"文件重命名成功: {originalName} -> {newName}");}catch (IOException ioe){MessageBox.Show($"重命名文件时发生错误: {ioe.Message}，文件: {originalName}");}catch (UnauthorizedAccessException uae){MessageBox.Show($"没有权限重命名文件: {uae.Message}，文件: {originalName}");}catch (Exception ex){MessageBox.Show($"未知错误在重命名文件时发生: {ex.Message}，文件: {originalName}");}}else{Console.WriteLine($"找不到原始文件: {originalName}");}//Console.WriteLine($"原文件名: {originalName}, 新文件名: {newName}");
                            }}}else{MessageBox.Show($"上传失败，错误码: {(int)response.Result.StatusCode}");}}catch (AggregateException ae){foreach (var innerEx in ae.InnerExceptions){MessageBox.Show($"发生错误: {innerEx.Message}");}}catch (Exception ex){MessageBox.Show($"发生错误: {ex.Message}");}}#endregion}}
}