C# HttpClient multipart/form-data upload

C# HttpClient multipart/form-data upload

To upload files using HttpClient with the multipart/form-data content type, you can use the MultipartFormDataContent class. Here's an example:

 using (var httpClient = new HttpClient()) { using (var form = new MultipartFormDataContent()) { // Add file to the request var fileContent = new ByteArrayContent(File.ReadAllBytes("file.txt")); form.Add(fileContent, "file", "file.txt"); // Add other parameters to the request if needed form.Add(new StringContent("parameter1"), "param1"); // Send the request to the server var response = await httpClient.PostAsync("http://example.com/upload", form); // Read the response from the server var responseContent = await response.Content.ReadAsStringAsync(); Console.WriteLine(responseContent); } }

In this example, we create an instance of HttpClient and MultipartFormDataContent. We then add the file to the request using the Add method of the MultipartFormDataContent object. We also add other parameters to the request if needed.

Once we have added all the necessary parameters to the request, we use the PostAsync method of HttpClient to send the request to the server. The server can then process the uploaded file and respond to the client.

Finally, we read the response from the server using the ReadAsStringAsync method of HttpContent, which returns the response as a string.

Examples

  1. "C# HttpClient multipart/form-data upload example"

    • Description: A basic example demonstrating how to use HttpClient to perform a multipart/form-data upload in C#.
    // Code Implementation using (var httpClient = new HttpClient()) { using (var formData = new MultipartFormDataContent()) { formData.Add(new StringContent("value1"), "field1"); formData.Add(new StringContent("value2"), "field2"); var fileContent = new ByteArrayContent(File.ReadAllBytes("path/to/file.txt")); fileContent.Headers.ContentDisposition = new ContentDispositionHeaderValue("attachment") { FileName = "file.txt" }; formData.Add(fileContent); var response = await httpClient.PostAsync("https://example.com/upload", formData); } }

  2. "C# HttpClient multipart/form-data upload with additional headers"

    • Description: Including additional headers in the multipart/form-data upload request using HttpClient in C#.
    // Code Implementation using (var httpClient = new HttpClient()) { using (var formData = new MultipartFormDataContent()) { formData.Add(new StringContent("value1"), "field1"); formData.Add(new StringContent("value2"), "field2"); var fileContent = new ByteArrayContent(File.ReadAllBytes("path/to/file.txt")); fileContent.Headers.ContentDisposition = new ContentDispositionHeaderValue("attachment") { FileName = "file.txt" }; formData.Add(fileContent); httpClient.DefaultRequestHeaders.Add("Authorization", "Bearer your_access_token"); var response = await httpClient.PostAsync("https://example.com/upload", formData); } }

  3. "C# HttpClient multipart/form-data upload with progress tracking"

    • Description: Tracking upload progress while performing a multipart/form-data upload using HttpClient in C#.
    // Code Implementation using (var httpClient = new HttpClient()) { using (var formData = new MultipartFormDataContent()) { formData.Add(new StringContent("value1"), "field1"); formData.Add(new StringContent("value2"), "field2"); var fileContent = new ByteArrayContent(File.ReadAllBytes("path/to/file.txt")); fileContent.Headers.ContentDisposition = new ContentDispositionHeaderValue("attachment") { FileName = "file.txt" }; formData.Add(fileContent); var progressHandler = new ProgressMessageHandler(new HttpClientHandler()); progressHandler.HttpSendProgress += (sender, args) => { // Track progress here }; using (var clientWithProgress = new HttpClient(progressHandler)) { var response = await clientWithProgress.PostAsync("https://example.com/upload", formData); } } }

  4. "C# HttpClient multipart/form-data upload with timeout settings"

    • Description: Configuring timeout settings for a multipart/form-data upload using HttpClient in C#.
    // Code Implementation using (var httpClient = new HttpClient()) { httpClient.Timeout = TimeSpan.FromSeconds(30); using (var formData = new MultipartFormDataContent()) { // ... (Same as previous examples) } var response = await httpClient.PostAsync("https://example.com/upload", formData); }

  5. "C# HttpClient multipart/form-data upload with custom filename"

    • Description: Uploading a file with a custom filename in a multipart/form-data request using HttpClient in C#.
    // Code Implementation using (var httpClient = new HttpClient()) { using (var formData = new MultipartFormDataContent()) { var fileContent = new ByteArrayContent(File.ReadAllBytes("path/to/file.txt")); fileContent.Headers.ContentDisposition = new ContentDispositionHeaderValue("attachment") { FileName = "custom_filename.txt" }; formData.Add(fileContent); var response = await httpClient.PostAsync("https://example.com/upload", formData); } }

  6. "C# HttpClient multipart/form-data upload with multiple files"

    • Description: Uploading multiple files in a single multipart/form-data request using HttpClient in C#.
    // Code Implementation using (var httpClient = new HttpClient()) { using (var formData = new MultipartFormDataContent()) { var file1Content = new ByteArrayContent(File.ReadAllBytes("path/to/file1.txt")); file1Content.Headers.ContentDisposition = new ContentDispositionHeaderValue("attachment") { FileName = "file1.txt" }; formData.Add(file1Content); var file2Content = new ByteArrayContent(File.ReadAllBytes("path/to/file2.txt")); file2Content.Headers.ContentDisposition = new ContentDispositionHeaderValue("attachment") { FileName = "file2.txt" }; formData.Add(file2Content); var response = await httpClient.PostAsync("https://example.com/upload", formData); } }

  7. "C# HttpClient multipart/form-data upload with custom headers per part"

    • Description: Setting custom headers for individual parts in a multipart/form-data upload using HttpClient in C#.
    // Code Implementation using (var httpClient = new HttpClient()) { using (var formData = new MultipartFormDataContent()) { var fileContent = new ByteArrayContent(File.ReadAllBytes("path/to/file.txt")); fileContent.Headers.ContentDisposition = new ContentDispositionHeaderValue("attachment") { FileName = "file.txt" }; fileContent.Headers.Add("Custom-Header", "Header-Value"); formData.Add(fileContent); var response = await httpClient.PostAsync("https://example.com/upload", formData); } }

  8. "C# HttpClient multipart/form-data upload with dynamic content"

    • Description: Dynamically constructing the content of a multipart/form-data request using HttpClient in C#.
    // Code Implementation using (var httpClient = new HttpClient()) { using (var formData = new MultipartFormDataContent()) { foreach (var keyValuePair in dynamicFormData) { formData.Add(new StringContent(keyValuePair.Value), keyValuePair.Key); } var response = await httpClient.PostAsync("https://example.com/upload", formData); } }

  9. "C# HttpClient multipart/form-data upload with cancellation token"

    • Description: Implementing cancellation token support for a multipart/form-data upload using HttpClient in C#.
    // Code Implementation using (var cancellationTokenSource = new CancellationTokenSource()) { using (var httpClient = new HttpClient()) { using (var formData = new MultipartFormDataContent()) { // ... (Same as previous examples) } try { var response = await httpClient.PostAsync("https://example.com/upload", formData, cancellationTokenSource.Token); } catch (TaskCanceledException) { // Handle cancellation } } }

  10. "C# HttpClient multipart/form-data upload with response handling"

    • Description: Handling the response of a multipart/form-data upload request using HttpClient in C#.
    // Code Implementation using (var httpClient = new HttpClient()) { using (var formData = new MultipartFormDataContent()) { // ... (Same as previous examples) } var response = await httpClient.PostAsync("https://example.com/upload", formData); if (response.IsSuccessStatusCode) { // Handle success var responseBody = await response.Content.ReadAsStringAsync(); } else { // Handle error var errorMessage = await response.Content.ReadAsStringAsync(); } }

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