Using EPPlus with a MemoryStream

Question

I am using EPPlus to generate an XLSX file in C#. As soon as I instantiate the ExcelPackage with a memory stream - I get the error:

\"A disk error occ

Answer 1

We had a similar issue when converting code that used the 4.1.1 version of EPPlus to the 4.5.1 version.

Originally, we were using the following pattern:

using (var ms = new MemoryStream())
{
    new ExcelBuilder().BuildResultFile(result, ms);
    ms.Position = 0;    // <-- Cannot access a closed Stream error thrown here
    // Send Excel file to Azure storage
}

And our ExcelBuilder class, BuildResultFile function:

public void BuildResultFile(List resultSets, Stream stream)
{
    using (var package = new ExcelPackage(stream))
    {
        // Create Excel file from resultSets
        package.Save();
    }
}

In order to make this work with 4.5.1 we had to remove using block from the BuildResultFile function.

I can't seem to find any documentation on in GitHub w/r/t why this changed or if I am even implementing this correctly.