Environment

• Pythonnet version: 2.5.1
• Python version: 3.8.2
• Operating System: Windows 10

Details

In PythonNet 2.5.1, I found correct/appropriate overloaded .Net methods are not invoked from Python while executing .Net code statements

for example please find the below code throws an error while trying to execute System.Data.DataRowCollection.Add(System.Data.DataRow) method.

Reference:https://docs.microsoft.com/en-us/dotnet/api/system.data.datarowcollection.add?view=netframework-4.8

Code:

#PYTHON 3.8.x PYTHONNET 2.5.1importclrclr.AddReference("System")clr.AddReference("System.Data")importSystemimportSystem.Datadt=System.Data.DataTable()col=System.Data.DataColumn()col.ColumnName="Id"col.DataType=System.Type.GetType("System.Int32")dt.Columns.Add(col)dr=dt.NewRow()dr["Id"]=10#Throws error while invoking void System.Data.DataRowCollection.Add(System.Data.DataRow row)try:dt.Rows.Add(dr)exceptExceptionase:print(e)#Working as expected while invoking System.Data.DataRow Add (params object[] values)dr=dt.Rows.Add(20)print(dr[0])

params_overloaded_function_precedence_issue.py.txt

Unable to cast object of type 'System.Data.DataRow' to type 'System.IConvertible'.Couldn't store <System.Data.DataRow> in Id Column. Expected type is Int32.
at System.Data.DataColumn.set_Item(Int32 record, Object value)
at System.Data.DataTable.NewRecordFromArray(Object[] value)
at System.Data.DataRowCollection.Add(Object[] values)

I could fix this issue in local repo by patching Python.Runtime.MethodBinder.GetPrecedence method, I set lower precedence to overloaded methods with Params array parameter

Please have a look and let me know your suggestions

-Parthasarathy K