如何在Umbraco中获取上传字段@item.GetPropertyValue("uploadPDF")的KB/MB大小值

Got it, let's break down how to get the formatted file size (KB/MB) for your uploadPDF field in Umbraco. Here's a straightforward approach that works for most recent Umbraco versions (8+), plus a note for older versions:

Step 1: Retrieve the media item linked to your upload field #

Umbraco's Upload property type stores a reference to a media node in your media library. First, we need to fetch that media node from the property:

@{
    // Get the media item associated with the uploadPDF field
    var pdfMedia = item.GetPropertyValue<IPublishedContent>("uploadPDF");
}

Step 2: Extract the raw file size in bytes #

Every media item in Umbraco has a built-in property umbracoBytes that stores the file size in bytes. We'll pull that value next:

if (pdfMedia != null)
{
    // Get the file size in bytes (umbracoBytes is a default media property)
    var fileSizeBytes = pdfMedia.GetPropertyValue<int>("umbracoBytes");
}

Step 3: Convert bytes to KB/MB for readability #

Now we'll format the raw byte value into a user-friendly string (KB or MB, with rounding for clarity):

string formattedFileSize;

if (fileSizeBytes >= 1024 * 1024)
{
    // Convert to MB, round to 2 decimal places
    formattedFileSize = $"{Math.Round(fileSizeBytes / (1024.0 * 1024.0), 2)} MB";
}
else if (fileSizeBytes >= 1024)
{
    // Convert to KB, round to 2 decimal places
    formattedFileSize = $"{Math.Round(fileSizeBytes / 1024.0, 2)} KB";
}
else
{
    // Fallback to bytes for tiny files
    formattedFileSize = $"{fileSizeBytes} Bytes";
}

// Output the result
<p>PDF File Size: @formattedFileSize</p>

Full Working Code #

Putting it all together with null checks to avoid errors if no file is uploaded:

@{
    var pdfMedia = item.GetPropertyValue<IPublishedContent>("uploadPDF");
    
    if (pdfMedia != null)
    {
        var fileSizeBytes = pdfMedia.GetPropertyValue<int>("umbracoBytes");
        string formattedFileSize;

        if (fileSizeBytes >= 1024 * 1024)
        {
            formattedFileSize = $"{Math.Round(fileSizeBytes / (1024.0 * 1024.0), 2)} MB";
        }
        else if (fileSizeBytes >= 1024)
        {
            formattedFileSize = $"{Math.Round(fileSizeBytes / 1024.0, 2)} KB";
        }
        else
        {
            formattedFileSize = $"{fileSizeBytes} Bytes";
        }
        
        <p>PDF File Size: @formattedFileSize</p>
    }
    else
    {
        <p>No PDF file uploaded.</p>
    }
}

Note for Umbraco 7 Users #

If you're on Umbraco 7, the Upload property returns a string (the media ID) instead of directly returning IPublishedContent. You'll need to use Umbraco.TypedMedia() to fetch the media item:

@{
    var pdfMediaId = item.GetPropertyValue<string>("uploadPDF");
    var pdfMedia = Umbraco.TypedMedia(pdfMediaId);
    
    // Rest of the logic remains the same as above
}

Quick Tips #

• Always include null checks to handle cases where no file has been uploaded.
• The umbracoBytes property is a default field for all media items, so it should exist for any file uploaded to the media library.
• Adjust the rounding (e.g., Math.Round(..., 1) for 1 decimal place) if you prefer a different formatting style.

内容的提问来源于stack exchange，提问作者Paul Gwamanda