How to Perform Multipart/Form-Data Uploads with HttpClient in .NET 4.5?

<.> Httpclient in the .NET 4.5 execute Multipart/form-data upload

Developers using HTTPClient in .NET 4.5 often encountered the problem of uploading Multipart/Form-Data. Despite online search, you may still not find a comprehensive example.

Let us solve this problem and provide a solution that allows you to effectively use the "MultipartFormDataContent" function upload data of HTTPClient's "MultipartFormDataContent".

Solution:

In order to use httpclient in the .NET 4.5 to promote Multipart/Form-Data upload, please follow the following steps:

Create the MultipartFormDataContent object:

Using the appropriate boundary strings to instantiate a "MultipartFormDataContent" object to ensure its uniqueness to prevent conflicts.

1. Add content to MultipartFormDataContent: Use the "ADD" method of "MultipartFormDataContent" to add data to upload. The name, file name and data itself specify the content of the content.
Send HTTP request:
2. "Postasync" method of HTTPClient to construct HTTP request messages, providing the target URL and "MultipartFormDataContent" object as the content. Receive and processing response:
Waiting for the response of the HTTP request, and use the "Readasstringasync" method to retrieve the content of the response. The resolution response is to extract the required data or further process the results.
3. Example:
4. The following code fragments illustrate how to use httpclient in the .NET 4.5 to implement Multipart/Form-Data upload:

This example demonstrates the above -mentioned steps and retrieves the data requested from the response. Please adjust the URL and other parameters to meet your specific upload requirements.

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