Could not load type system.runtime.compilerServices.CallSite

Kao Xue LIU (SP) 0

system.runtime.compilerServices.CallSite error when accessing Excel by C#

1 answer

Limitless Technology 44,496 Reputation points

2023-09-11T14:47:48.1233333+00:00

Hello there,

Can you share your code so that it might for the community?

Because the error is generic, it is difficult to detect the source.

I suggest to check if all involved objects are valid. Another check might be trying to read the cell first.

Hope this resolves your Query !!

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Kao Xue LIU (SP) 0 Reputation points

2023-09-12T04:15:59.2833333+00:00

Thanks for your answer.

I am trying to develop a Revit Addin which will extract Revit model information and export to Excel.

Here is the using part:

using System;

using System.Collections.Generic;

using System.Linq;

using Excel = Microsoft.Office.Interop.Excel;

using System.Reflection;

using Autodesk.Revit.DB;

using Autodesk.Revit.UI;

using Autodesk.Revit.UI.Selection;

using Autodesk.Revit.ApplicationServices;

using Autodesk.Revit.Attributes;

using Autodesk.Revit.UI.Events;

using System.Diagnostics;

using System.ComponentModel.DataAnnotations.Schema;

using System.IO;

//

... ...

//

I have tried to debug the code line by line until it reached to the part below.

// try { // Excel string xslFilename = "D:/AY2324/BE8136BIM/BIMDevelopment/Summary.xlsx"; Excel.Application oXL; oXL = new Excel.Application(); oXL.Visible = true; Excel._Workbook oWB; oWB = oXL.Workbooks.Open(xslFilename); Excel.Range oRng; Excel._Worksheet oSheet; // up to here the code works well //oWB=oXL.Worksheets[1].Activate(); // Err message when this line is added // Err message : Could not load type ' System.Runtime.CompilerServices.CallSite'1 from assembly 'System.Ling.Expessions, ... ... //oSheet=(Excel._Worksheet) oWB.ActiveSheet(); // Nor does this line work
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Could not load type system.runtime.compilerServices.CallSite

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