当我尝试使用 ExcelDataReader 将文件上传到数据库时出现“不支持指定的方法”错误

Question

I've written a method, BulkCopy, to upload my Excel file to SQL Server database table. I am trying to unit test this and it fails each time with "System.NotSupportedException : Specified method is not supported".

If someone could have a look it would be much appreciated.

Kind regards,

Emmett

    public static void BulkCopy(string inputFilePath, string tableName)
    {

        System.Text.Encoding.RegisterProvider(System.Text.CodePagesEncodingProvider.Instance);
        var stream = File.Open(inputFilePath, FileMode.Open, FileAccess.Read);
        using (var reader = ExcelReaderFactory.CreateReader(stream))
        {
            using (var bulkCopy = new SqlBulkCopy(ConnectionString))
            {

                bulkCopy.EnableStreaming = true;
                bulkCopy.DestinationTableName = tableName;
                reader.Read();
                var cols = Enumerable.Range(0, reader.FieldCount).Select(i => reader.GetValue(i)).ToArray();
                foreach (var col in cols)
                {
                    var column = cols.GetValue(0).ToString();

                    if (column.Trim() == "Column 1")
                    {
                        bulkCopy.ColumnMappings.Add(column, "Column 1");
                    }

                    if (column.Trim() == "Column 2")
                    {
                        bulkCopy.ColumnMappings.Add(column, "Column 2");
                    }

                    if (column.Trim() == "Column 3")
                    {
                        bulkCopy.ColumnMappings.Add(column, "Column 3");
                    }

                //continued for column mappings...

                }

                bulkCopy.WriteToServer(reader);
            }
            Console.WriteLine("Copy data to database done (DataReader).");
        }
    }

Answer 1

I tested your code ,the issue is showed in the following code ,you reader is incorrect.

bulkCopy.WriteToServer(reader);

Pass the datatable into bulk , try the below code

public static void BulkCopy(string inputFilePath, string tableName)
    {
        System.Text.Encoding.RegisterProvider(System.Text.CodePagesEncodingProvider.Instance);
        var stream = System.IO.File.Open(inputFilePath, FileMode.Open, FileAccess.Read);
        IExcelDataReader reader;

        if (inputFilePath.EndsWith(".xls"))
            reader = ExcelReaderFactory.CreateBinaryReader(stream);
        else if (inputFilePath.EndsWith(".xlsx"))
            reader = ExcelReaderFactory.CreateOpenXmlReader(stream);
        else
            throw new Exception("The file to be processed is not an Excel file");
        var conf = new ExcelDataSetConfiguration
        {
            ConfigureDataTable = _ => new ExcelDataTableConfiguration
            {
                UseHeaderRow = true
            }
        };
        var dataSet = reader.AsDataSet(conf);

        // Now you can get data from each sheet by its index or its "name"
        var dataTable = dataSet.Tables[0];

        using (var bulkCopy = new SqlBulkCopy(ConnectionString))
            {
                bulkCopy.EnableStreaming = true;
                bulkCopy.DestinationTableName = tableName;
                reader.Read();
                var cols = Enumerable.Range(0, reader.FieldCount).Select(i => reader.GetValue(i)).ToArray();
                foreach (var col in cols)
                {
                    var column =col.ToString();

                    if (column.Trim() == "Column 1")
                    {
                        bulkCopy.ColumnMappings.Add(column, "Column1");
                    }

                    if (column.Trim() == "Column 2")
                    {
                        bulkCopy.ColumnMappings.Add(column, "Column2");
                    }

                    if (column.Trim() == "Column 3")
                    {
                        bulkCopy.ColumnMappings.Add(column, "Column3");
                    }

                    //continued for column mappings...

                }
                bulkCopy.WriteToServer(dataTable);
            }
            Console.WriteLine("Copy data to database done (DataReader).");           
    }

Pass the dataReader into bulk , change your foreach part as shown

               for (var i = 0; i<cols.Count();i++)
                {
                    if (cols[i].ToString().Trim() == "Column 1")
                    {
                        bulkCopy.ColumnMappings.Add(i, "Column1");
                    }

                    if (cols[i].ToString().Trim() == "Column 2")
                    {
                        bulkCopy.ColumnMappings.Add(i, "Column2");
                    }

                    if (cols[i].ToString().Trim() == "Column 3")
                    {
                        bulkCopy.ColumnMappings.Add(i, "Column3");
                    }

                    //continued for column mappings...

                }

Answer 2

You need to change the way it's setting the column mappings. If you delete them it will work. In the example link you posted they are using GetName to get the columns. I tried that and it doesn't work for some reason. I get a GetOrdinal error. That's the same error that is coming from your code: ExcelDataReader.ExcelDataReader`2.GetOrdinal(String name) .

Not sure how pretty it is, but it works.

public static void BulkCopy(string inputFilePath, string tableName)
    {

        System.Text.Encoding.RegisterProvider(System.Text.CodePagesEncodingProvider.Instance);
        var stream = File.Open(inputFilePath, FileMode.Open, FileAccess.Read);
        using (var reader = ExcelReaderFactory.CreateReader(stream))
        {
            using (var bulkCopy = new SqlBulkCopy(ConnectionString))
            {

                bulkCopy.EnableStreaming = true;
                bulkCopy.DestinationTableName = tableName;
                reader.Read();
                var cols = Enumerable.Range(0, reader.FieldCount).Select(i => reader.GetValue(i)).ToArray();
                foreach (var col in cols)
                {
                     if (cols[i].ToString() == "Column 1")
                     {
                          bulkCopy.ColumnMappings.Add(i, "Column 1");
                     }

                     if (cols[i].ToString() == "Column 2")
                     {
                          bulkCopy.ColumnMappings.Add(i, "Column 2");
                     }

                     if (cols[i].ToString() == "Column 3")
                     {
                          bulkCopy.ColumnMappings.Add(i, "Column 3");
                     }

                    //continued for column mappings...

                }

                bulkCopy.WriteToServer(reader);
            }
            Console.WriteLine("Copy data to database done (DataReader).");
        }
    }