File Upload Pre-Processing

If you have the need to pre-process files before they are saved to Dataverse, there is a way to hook into the upload process to allow for custom handling of the file.

// In your startup class call the following:
services.Configure<FileSaveOptions>(options => {
    // Files can be saved to a temporary folder on the server or to an in-memory stream.
    options.SaveMode = FileSaveMode.SaveToTemporaryFolder;

    // Specify your pre-process handler
    options.FileProcessorMethod = async (columnFileInfo) => {
        // Perform your processing here
        var mutatedFileData = SomeMethodToManipulateTheByteArray(columnFileInfo.FileInfo.Data)
        return new FileInfo { FileName="New File Name", Data=mutatedFileData};
    };
});