Question

当我执行这个程序时，Excel部分会生成字符串数组：cellValue就好了。

当它插入SQL MDF数据库时：MDFExcel每个单元格显示：“System .__ ComObject”。

如何显示字符串值而不是“System .__ ComObject”？

protected void Button1_Click(Object sender, EventArgs e)
    {
        DataSet ds = new DataSet();
        //From Excel
        Microsoft.Office.Interop.Excel.Application exlApp = new Microsoft.Office.Interop.Excel.Application();
        Microsoft.Office.Interop.Excel.Workbook exlWb = exlApp.Workbooks.Open(@"C:\Users\Optiplex760\Documents\a  Excel\ExcelToMDF.xls");
        Microsoft.Office.Interop.Excel.Worksheet exlWs= exlWb.Sheets["Sheet1"];
        Microsoft.Office.Interop.Excel.Range usedRange = exlWs.UsedRange;
        int col = Convert.ToInt32(usedRange.Columns.Count);
        int row = Convert.ToInt32(usedRange.Rows.Count);
        exlApp.Visible = true;
        string[,] cellValue = new string[row + 1, col + 1];
        for (int j = 1; j <= row-1; j++)
        {
            for (int k = 1; k <= col-1; k++)
            {
                cellValue[j, k] = exlWs.Cells[j+1,k+1].ToString();
            }
        }
        exlWb.Close();
        exlWs = null;
        exlWb = null;
        exlApp.Quit();
        exlApp = null;
        //To MSSQL
        String connStr, cmdStr;
        connStr = ConfigurationManager.ConnectionStrings["MDFExceldb"].ConnectionString; 
        for (int h = 1; h<row; h++)
        {
            cmdStr = "INSERT INTO [Table1] (col1,col2,col3) VALUES (@col1,@col2,@col3);";
            try
            {
                using (SqlConnection conn = new SqlConnection(connStr))
                {
                    using (SqlCommand cmd = new SqlCommand(cmdStr, conn))
                    {
                        conn.Open();
                        cmd.Parameters.AddWithValue("@col1", cellValue[1, h]);
                        cmd.Parameters.AddWithValue("@col2", cellValue[2, h]);
                        cmd.Parameters.AddWithValue("@col3", cellValue[3, h]);
                        cmd.ExecuteNonQuery();
                        conn.Close();
                        cmd.Dispose();
                        conn.Dispose();
                    }
                }
            }
            catch (Exception ex)
            {
                Label2.Text = ex.ToString();
            }
        }
    }

Answer 1

Worksheet.Cells返回Range而不是单个值 - 而Range（RCW对象）未实现合理的ToString;因此它默认为显示的“System .__ ComObject”值。

使用范围的Text属性，例如

cellValue[j, k] = Convert.ToString(exlWs.Cells[j+1,k+1].Text);

虽然这应该解决眼前的问题，但它也是效率低下的进程。请参阅this response（使用Value/Value2属性）了解如何将Range值作为二维数组进行访问，并减少过多的范围切片。

SQL MDF数据库每个单元格显示：“System .__ ComObject”

1 个答案: