c# - 来自数据源的 String 类型的给定值无法转换为指定目标列的 float 类型

Question

我想知道是否有人可以提供帮助。我正在尝试读取 C# 中的 CSV 文件并将其数据导入到我在 SQL 2008 中创建的表中。

出于某种原因，我不断收到以下错误:

"The given value of type String from the data source cannot be converted to type float of the specified target column."

完整的堆栈跟踪:

System.Data.SqlClient.SqlBulkCopy.ConvertValue(Object value, _SqlMetaData metadata, Boolean isNull, Boolean& isSqlType, Boolean& coercedToDataFeed)
System.Data.SqlClient.SqlBulkCopy.ReadWriteColumnValueAsync(Int32 col)
System.Data.SqlClient.SqlBulkCopy.CopyColumnsAsync(Int32 col, TaskCompletionSource`1 source)
System.Data.SqlClient.SqlBulkCopy.CopyRowsAsync(Int32 rowsSoFar, Int32 totalRows, CancellationToken cts, TaskCompletionSource`1 source)
System.Data.SqlClient.SqlBulkCopy.CopyBatchesAsyncContinued(BulkCopySimpleResultSet internalResults, String updateBulkCommandText, CancellationToken cts, TaskCompletionSource`1 source)
System.Data.SqlClient.SqlBulkCopy.CopyBatchesAsync(BulkCopySimpleResultSet internalResults, String updateBulkCommandText, CancellationToken cts, TaskCompletionSource`1 source)
System.Data.SqlClient.SqlBulkCopy.WriteToServerInternalRestContinuedAsync(BulkCopySimpleResultSet internalResults, CancellationToken cts, TaskCompletionSource`1 source)
System.Data.SqlClient.SqlBulkCopy.WriteToServerInternalRestAsync(CancellationToken cts, TaskCompletionSource`1 source)
System.Data.SqlClient.SqlBulkCopy.WriteToServerInternalAsync(CancellationToken ctoken)
System.Data.SqlClient.SqlBulkCopy.WriteRowSourceToServerAsync(Int32 columnCount, CancellationToken ctoken)
System.Data.SqlClient.SqlBulkCopy.WriteToServer(DataTable table, DataRowState rowState)
System.Data.SqlClient.SqlBulkCopy.WriteToServer(DataTable table)
RMBEventReportingSystemPOC.Admin.ProcessFile(String strFilename) in \Admin.aspx.cs:line 159

请在下面找到我正在使用的代码。请让我知道哪里出错了:

StatusLabel.Text = "File Process status: File process started!";
try
{

    //var fileName = string.Format(strFilename, Directory.GetCurrentDirectory());

    SqlConnection con = new SqlConnection(@"**ConnectionString**");

    string filepath = Server.MapPath("~/uploads/") + strFilename;
    StreamReader sr = new StreamReader(filepath);
    string line = sr.ReadLine();
    string[] value = line.Split(';');
    DataTable dt = new DataTable();
    DataRow row;
    foreach (string dc in value)
    {
        if (dc == "Month" || dc == "Year" || dc == "Reply")
            dt.Columns.Add(new DataColumn(dc, typeof(int)));
        else if (dc == "CostPerHead" || dc == "TotalCost")
            dt.Columns.Add(new DataColumn(dc, typeof(float)));
        else
            dt.Columns.Add(new DataColumn(dc));
    }

    while (!sr.EndOfStream)
    {
        value = sr.ReadLine().Split(';');
        if (value.Length == dt.Columns.Count)
        {
            row = dt.NewRow();


            //fix up default values                        
            value[1] = value[1] == "" ? "0" : value[1].ToString().Trim();
            value[2] = value[2] == "" ? "0" : value[2].ToString().Trim();
            value[3] = value[3] == "" ? "0.00" : string.Format("{0:0.00}",value[3].ToString());
            value[4] = value[4] == "" ? "0.00" : string.Format("{0:0.00}",value[4].ToString());
            value[7] = value[7] == "" ? "0" : value[7].ToString().Trim();

            row.ItemArray = value;

            dt.Rows.Add(row);
        }
    }

    ////fix up default values

    for (int i = 0; i < dt.Rows.Count; i++)
    {

        dt.Rows[i][1] = int.Parse(dt.Rows[i][1].ToString().Trim());
        dt.Rows[i][2] = int.Parse(dt.Rows[i][2].ToString().Trim());
        dt.Rows[i][3] = Math.Round(float.Parse(dt.Rows[i][3].ToString() + ".00"), 2);
        dt.Rows[i][4] = Math.Round(float.Parse(dt.Rows[i][4].ToString() + ".00"), 2);

        dt.Rows[i][7] = dt.Rows[i][7].ToString() == "" ? 0 : int.Parse(dt.Rows[i]["Reply"].ToString().Trim());
    }

    SqlBulkCopy bc = new SqlBulkCopy(con.ConnectionString, SqlBulkCopyOptions.TableLock);
    bc.DestinationTableName = "Guestlist";
    bc.BatchSize = dt.Rows.Count;
    // add column mappings if necessary               
    con.Open();
    bc.WriteToServer(dt);
    bc.Close();
    con.Close();


    StatusLabel.Text = "File Process status: File process completed! " + dt.Rows.Count.ToString() + " records imported.";
    StatusLabel.CssClass = "success";
}
catch (Exception exx)
{

    StatusLabel.Text = "File Process status: File process failed!: " + exx.Message;
    StatusLabel.CssClass = "error";
}

如有任何指点，我们将不胜感激。

Answer 1

SqlBulkCopy.WriteToServer(DataTable) 如果 DataTable 的列顺序与数据库中表定义的列顺序不同(当这导致类型或长度不兼容)。显然 WriteToServer 方法不映射列名。