在Windowsforms應用中將gridview導入excel

2

這是一個漫長的答案，但在這裏不言而喻。

嘗試創建下面的類...

public class ExcelWriter : IDisposable 
{ 
    private XmlWriter _writer; 

    public enum CellStyle { General, Number, Currency, DateTime, ShortDate }; 

    public void WriteStartDocument() 
    { 
     if (_writer == null) throw new NotSupportedException("Cannot write after closing."); 

     _writer.WriteProcessingInstruction("mso-application", "progid=\"Excel.Sheet\""); 
     _writer.WriteStartElement("ss", "Workbook", "urn:schemas-microsoft-com:office:spreadsheet"); 
     WriteExcelStyles(); 
    } 

    public void WriteEndDocument() 
    { 
     if (_writer == null) throw new NotSupportedException("Cannot write after closing."); 

     _writer.WriteEndElement(); 
    } 

    private void WriteExcelStyleElement(CellStyle style) 
    { 
     _writer.WriteStartElement("Style", "urn:schemas-microsoft-com:office:spreadsheet"); 
     _writer.WriteAttributeString("ID", "urn:schemas-microsoft-com:office:spreadsheet", style.ToString()); 
     _writer.WriteEndElement(); 
    } 

    private void WriteExcelStyleElement(CellStyle style, string NumberFormat) 
    { 
     _writer.WriteStartElement("Style", "urn:schemas-microsoft-com:office:spreadsheet"); 

     _writer.WriteAttributeString("ID", "urn:schemas-microsoft-com:office:spreadsheet", style.ToString()); 
     _writer.WriteStartElement("NumberFormat", "urn:schemas-microsoft-com:office:spreadsheet"); 
     _writer.WriteAttributeString("Format", "urn:schemas-microsoft-com:office:spreadsheet", NumberFormat); 
     _writer.WriteEndElement(); 

     _writer.WriteEndElement(); 

    } 

    private void WriteExcelStyles() 
    { 
     _writer.WriteStartElement("Styles", "urn:schemas-microsoft-com:office:spreadsheet"); 

     WriteExcelStyleElement(CellStyle.General); 
     WriteExcelStyleElement(CellStyle.Number, "General Number"); 
     WriteExcelStyleElement(CellStyle.DateTime, "General Date"); 
     WriteExcelStyleElement(CellStyle.Currency, "Currency"); 
     WriteExcelStyleElement(CellStyle.ShortDate, "Short Date"); 

     _writer.WriteEndElement(); 
    } 

    public void WriteStartWorksheet(string name) 
    { 
     if (_writer == null) throw new NotSupportedException("Cannot write after closing."); 

     _writer.WriteStartElement("Worksheet", "urn:schemas-microsoft-com:office:spreadsheet"); 
     _writer.WriteAttributeString("Name", "urn:schemas-microsoft-com:office:spreadsheet", name); 
     _writer.WriteStartElement("Table", "urn:schemas-microsoft-com:office:spreadsheet"); 
    } 

    public void WriteEndWorksheet() 
    { 
     if (_writer == null) throw new NotSupportedException("Cannot write after closing."); 

     _writer.WriteEndElement(); 
     _writer.WriteEndElement(); 
    } 

    public ExcelWriter(string outputFileName) 
    { 
     XmlWriterSettings settings = new XmlWriterSettings(); 
     settings.Indent = true; 
     _writer = XmlWriter.Create(outputFileName, settings); 
    } 

    public void Close() 
    { 
     if (_writer == null) throw new NotSupportedException("Already closed."); 

     _writer.Close(); 
     _writer = null; 
    } 

    public void WriteExcelColumnDefinition(int columnWidth) 
    { 
     if (_writer == null) throw new NotSupportedException("Cannot write after closing."); 

     _writer.WriteStartElement("Column", "urn:schemas-microsoft-com:office:spreadsheet"); 
     _writer.WriteStartAttribute("Width", "urn:schemas-microsoft-com:office:spreadsheet"); 
     _writer.WriteValue(columnWidth); 
     _writer.WriteEndAttribute(); 
     _writer.WriteEndElement(); 
    } 

    public void WriteExcelUnstyledCell(string value) 
    { 
     if (_writer == null) throw new NotSupportedException("Cannot write after closing."); 

     _writer.WriteStartElement("Cell", "urn:schemas-microsoft-com:office:spreadsheet"); 
     _writer.WriteStartElement("Data", "urn:schemas-microsoft-com:office:spreadsheet"); 
     _writer.WriteAttributeString("Type", "urn:schemas-microsoft-com:office:spreadsheet", "String"); 
     _writer.WriteValue(value); 
     _writer.WriteEndElement(); 
     _writer.WriteEndElement(); 
    } 

    public void WriteStartRow() 
    { 
     if (_writer == null) throw new NotSupportedException("Cannot write after closing."); 

     _writer.WriteStartElement("Row", "urn:schemas-microsoft-com:office:spreadsheet"); 
    } 

    public void WriteEndRow() 
    { 
     if (_writer == null) throw new NotSupportedException("Cannot write after closing."); 

     _writer.WriteEndElement(); 
    } 

    public void WriteExcelStyledCell(object value, CellStyle style) 
    { 
     if (_writer == null) throw new NotSupportedException("Cannot write after closing."); 

     _writer.WriteStartElement("Cell", "urn:schemas-microsoft-com:office:spreadsheet"); 
     _writer.WriteAttributeString("StyleID", "urn:schemas-microsoft-com:office:spreadsheet", style.ToString()); 
     _writer.WriteStartElement("Data", "urn:schemas-microsoft-com:office:spreadsheet"); 
     switch (style) 
     { 
      case CellStyle.General: 
       _writer.WriteAttributeString("Type", "urn:schemas-microsoft-com:office:spreadsheet", "String"); 
       break; 
      case CellStyle.Number: 
      case CellStyle.Currency: 
       _writer.WriteAttributeString("Type", "urn:schemas-microsoft-com:office:spreadsheet", "Number"); 
       break; 
      case CellStyle.ShortDate: 
      case CellStyle.DateTime: 
       _writer.WriteAttributeString("Type", "urn:schemas-microsoft-com:office:spreadsheet", "DateTime"); 
       break; 
     } 
     _writer.WriteValue(value); 
     // tag += String.Format("{1}\"><ss:Data ss:Type=\"DateTime\">{0:yyyy\\-MM\\-dd\\THH\\:mm\\:ss\\.fff}</ss:Data>", value, 

     _writer.WriteEndElement(); 
     _writer.WriteEndElement(); 
    } 

    public void WriteExcelAutoStyledCell(object value) 
    { 
     if (_writer == null) throw new NotSupportedException("Cannot write after closing."); 

     //write the <ss:Cell> and <ss:Data> tags for something 
     if (value is Int16 || value is Int32 || value is Int64 || value is SByte || 
      value is UInt16 || value is UInt32 || value is UInt64 || value is Byte) 
     { 
      WriteExcelStyledCell(value, CellStyle.Number); 
     } 
     else if (value is Single || value is Double || value is Decimal) //we'll assume it's a currency 
     { 
      WriteExcelStyledCell(value, CellStyle.Currency); 
     } 
     else if (value is DateTime) 
     { 
      //check if there's no time information and use the appropriate style 
      WriteExcelStyledCell(value, ((DateTime)value).TimeOfDay.CompareTo(new TimeSpan(0, 0, 0, 0, 0)) == 0 ? CellStyle.ShortDate : CellStyle.DateTime); 
     } 
     else 
     { 
      WriteExcelStyledCell(value, CellStyle.General); 
     } 
    } 

    #region IDisposable Members 

    public void Dispose() 
    { 
     if (_writer == null) 
      return; 

     _writer.Close(); 
     _writer = null; 
    } 

    #endregion 
}

，然後在winform應用程序創建下面的函數...

 public static void ExcelExport(DataTable data, String fileName, bool openAfter) 
    { 
     //export a DataTable to Excel 
     DialogResult retry = DialogResult.Retry; 
     OpenFileDialog openFileDialog = new OpenFileDialog(); 

     while (retry == DialogResult.Retry) 
     { 
      try 
      { 
       using (ExcelWriter writer = new ExcelWriter(fileName)) 
       { 
        writer.WriteStartDocument(); 

        // Write the worksheet contents 
        writer.WriteStartWorksheet("Sheet1"); 

        //Write header row 
        writer.WriteStartRow(); 
        foreach (DataColumn col in data.Columns) 
         writer.WriteExcelUnstyledCell(col.Caption); 
        writer.WriteEndRow(); 

        //write data 
        foreach (DataRow row in data.Rows) 
        { 
         writer.WriteStartRow(); 
         foreach (object o in row.ItemArray) 
         { 
          if (Convert.IsDBNull(o)) 
          { 
           writer.WriteExcelUnstyledCell(String.Empty); 
          } 
          else 
          { 
           writer.WriteExcelAutoStyledCell(o); 
          } 
         } 
         writer.WriteEndRow(); 
        } 

        // Close up the document 
        writer.WriteEndWorksheet(); 
        writer.WriteEndDocument(); 
        writer.Close(); 
        if (openAfter) 
        { 
         openFileDialog.FileName = fileName; 
         //openFileDialog.ShowDialog(); 
          openFileDialog.OpenFile(); 
        } 
        retry = DialogResult.Cancel; 

       } 
      } 
      catch (Exception myException) 
      { 
       retry = MessageBox.Show(myException.Message, "Excel Export", MessageBoxButtons.RetryCancel, MessageBoxIcon.Asterisk); 
      } 
     } 

    }

最後，用它從你期望的事件試試這個/方法...

ExcelExport('YourdDataTable',"NameOfYourFile.xml",true);

來源

2010-03-08 12:39:21

+1

你的代碼是簡單的表值工作nice..its ......但我在我的數據庫使用層次....所以其顯示一些錯誤...那麼如何解決這個問題呢？ – Suryakavitha

+0

我發現的唯一錯誤是'Xml type'xdt：untypedAtomic列表不支持從Clr類型'Guid'到Clr類型'String'的轉換。「這是因爲他的代碼不檢查GUID。所以我修改了一下他的代碼，這樣你也可以檢查我的答案。 –

1

看一看

Exporting a DataGridView to Excel in .NET 2.0 (C# code)

來源

2010-03-08 12:09:45

0

根據@Refracted Paladin的回答，我發現的唯一錯誤是

Xml type 'List of xdt:untypedAtomic' does not support a conversion from Clr type 'Guid' to Clr type 'String'.

這是因爲他的代碼不檢查GUID。所以我修改了一下他的代碼，以便你也可以檢查我的答案。

Type _Type = o.GetType(); 
if (_Type.Equals(typeof(System.Guid))) 
{ 
    string GuidValueStr = Convert.ToString(o);          
    writer.WriteExcelAutoStyledCell((object)GuidValueStr);  
}

後，我改變了功能

public static void ExcelExport(DataTable data, String fileName) 
{ 
    try 
    { 
     using (ExcelWriter_StackOverFlow writer = new ExcelWriter_StackOverFlow(fileName)) 
     { 
      writer.WriteStartDocument(); 

      // Write the worksheet contents 
      writer.WriteStartWorksheet("Sheet1"); 

      //Write header row 
      writer.WriteStartRow(); 
      foreach (DataColumn col in data.Columns) 
       writer.WriteExcelUnstyledCell(col.Caption); 
      writer.WriteEndRow(); 

      //write data 
      foreach (DataRow row in data.Rows) 
      { 
       writer.WriteStartRow(); 
       foreach (object o in row.ItemArray) 
       { 
        if (o.ToString().Length <= 0) 
        { 
         writer.WriteExcelAutoStyledCell(string.Empty); 
        } 
        else { 
         Type _Type = o.GetType(); 
         if (_Type.Equals(typeof(System.Guid))) 
         { 
          string GuidValueStr = Convert.ToString(o);          
          writer.WriteExcelAutoStyledCell((object)GuidValueStr); 
          continue; 
         } 
         writer.WriteExcelAutoStyledCell(o); 
        } 
       } 
       writer.WriteEndRow(); 
      } 

      // Close up the document 
      writer.WriteEndWorksheet(); 
      writer.WriteEndDocument(); 
      writer.Close(); 

     } 
    } 
    catch (Exception myException) 
    { 
     throw myException; 
    }    
}

來源

2015-05-28 07:42:11

在Windowsforms應用中將gridview導入excel

回答

相關問題