title: .Net Core app can't write file to any folder OSX
body: <p>I am building a .net core 2.0 app in OSX, its a WebAPI app that when an API endpoint is hit creates a .xlsx with dummy data. When I try to run it (dotnet run) I get </p>
  
  <pre><code>System.UnauthorizedAccessException: Access to the path '/Users/myuser/projects/myproject' is denied. ---&gt; System.IO.IOException: Permission denied
  </code></pre>
  
  <p>I have tried running it as sudo and changing the folder it is writing to and neither helped</p>
  
  <pre><code>// GET api/values/5
      [HttpGet("{id}")]
      public string Get(int id)
      {
          CreatePackage("./");
          return "value";
      }
  
      public void CreatePackage(string filePath)
      {
          using (SpreadsheetDocument package = SpreadsheetDocument.Create(filePath, SpreadsheetDocumentType.Workbook))
          {
              CreateParts(package);
          }
      }
  
      private void CreateParts(SpreadsheetDocument document)
      {
          WorkbookPart workbookPart = document.AddWorkbookPart();
          GenerateWorkbookPartContent(workbookPart);
  
          WorksheetPart worksheetPart = workbookPart.AddNewPart&lt;WorksheetPart&gt;("rId1");
          GenerateWorksheetPartContent(worksheetPart);
      }
  
      private void GenerateWorkbookPartContent(WorkbookPart workbookPart)
      {
          Workbook workbook = new Workbook();
          workbook.AddNamespaceDeclaration("r", "http://schemas.openxmlformats.org/officeDocument/2006/relationships");
  
          Sheets sheets = new Sheets();
          Sheet sheet = new Sheet() { Name = "Sheet", SheetId = (UInt32Value)1U, Id = "rId1" };
          sheets.Append(sheet);
  
          workbook.Append(sheets);
          workbookPart.Workbook = workbook;
      }
  
      private void GenerateWorksheetPartContent(WorksheetPart worksheetPart)
      {
          Worksheet worksheet = new Worksheet();
          SheetData sheetData = new SheetData();
  
          Row row = new Row();
          Cell cell = new Cell() { CellReference = "A1", DataType = CellValues.InlineString };
          InlineString inlineString = new InlineString();
          Text text = new Text();
          text.Text = "hello";
          inlineString.Append(text);
          cell.Append(inlineString);
          row.Append(cell);
  
          sheetData.Append(row);
          worksheet.Append(sheetData);
          worksheetPart.Worksheet = worksheet;
      }
  </code></pre>
  
  <p>This is the main parts of the class, I am creating the file (for now) in the project folder. I saw posts about giving read write permissions to all of my files for the CLI but that doesn't seem ideal. Also I saw <a href="https://stackoverflow.com/questions/8821410/why-is-access-to-the-path-denied">this</a> about setting attributes on files, but this is the OpenXml spreadsheet create method and as far as I can tell it doesnt have anything about setting file permissions (and it would need to be at the folder anyway)</p>
  
  <p>Any help would be much appreciated</p>