调用SetText/SetHeader为BackgroundUploaderContentPart传空值崩溃，求解决方案

Yep, you’ve run into a strict validation rule built into those BackgroundUploaderContentPart methods—both SetText() and SetHeader() will throw a value exception if you pass a null or empty string, which is exactly why your app is crashing.

Here are the practical workarounds and key notes to resolve this:

• Skip calling the method entirely: If that text or header field isn’t mandatory for your upload request, just don’t invoke SetText() or SetHeader() for that content part. The API won’t look for a value if you don’t provide it, so you’ll avoid the validation check altogether.
• Use a whitespace placeholder for "empty" value needs: If the endpoint you’re uploading to expects a value (even an empty-like one), try passing a single space (" ") instead of an empty string. This gets past the null/empty validation, and many services will treat it as an empty value when processing the request.
• You can’t clear existing values with null: If you’re trying to remove a text/header you already set, null/empty won’t work. Instead, you’ll need to create a new BackgroundUploaderContentPart instance without that value—once you set a value via those methods, it’s immutable on that instance.

It’s also worth double-checking whether your use case actually requires sending an empty value. Often, omitting the field entirely aligns with HTTP standards better than sending an empty string or null.

内容的提问来源于stack exchange，提问作者Edged