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C#导出数据到Excel的代码

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C#导出数据到Excel的代码

using System;
using System.Collections.Generic;
using System.Text;
using System.Data;
using System.Windows.Forms;
using System.IO;
 
namespace TopAPI
{
    class ExcelCreate
        {
        public void CreateCsv(System.Data.DataTable dt, string strName)
         {
             
         
            
            //先打印标头
            StringBuilder strColu=new StringBuilder();
            StringBuilder strValue=new StringBuilder();
            int i=0;
    
            try
            {
                StreamWriter sw = new StreamWriter(new FileStream(strName+".csv", FileMode.Create), Encoding.GetEncoding("GB2312"));
                for( i=0;i<=dt.Columns.Count-1;i++)
                {
                    strColu.Append("/""+dt.Columns[i].ColumnName+"/"");
                    strColu.Append(",");                }
                    strColu.Remove(strColu.Length-1,1);//移出掉最后一个,字符
                    sw.WriteLine(strColu);
                foreach(DataRow dr in dt.Rows)
                {
                    strValue.Remove(0,strValue.Length);//移出
        
                    for(i=0;i<=dt.Columns.Count-1;i++)                    {
                        strValue.Append("/""+dr[i].ToString().Replace("'","''").Replace (",",",")+"/"");
                        strValue.Append(",");
                    }
                        strValue.Remove(strValue.Length-1,1);//移出掉最后一个,字符
                        sw.WriteLine(strValue);
                }
                
                sw.Close();
            }
            catch(Exception ex)
            {
                MessageBox.Show(ex.Message);
            }
          
                
        }
        public   void CreateExcel(DataTable source, string fileName)
        {
            System.IO.StreamWriter excelDoc;
            excelDoc = new System.IO.StreamWriter(fileName);
            const string startExcelXML = @"<xml version> <Workbook " +
                  "xmlns=/"urn:schemas-microsoft-com:office:spreadsheet/" " +
                  " xmlns:o=/"urn:schemas-microsoft-com:office:office/"  " +
                  "xmlns:x=/"urn:schemas-    microsoft-com:office:" +
                  "excel/"  xmlns:ss=/"urn:schemas-microsoft-com:" +
                  "office:spreadsheet/">  <Styles>  " +
                  "<Style ss:ID=/"Default/" ss:Name=/"Normal/">  " +
                  "<Alignment ss:Vertical=/"Bottom/"/>  <Borders/>" +
                  "  <Font/>  <Interior/>  <NumberFormat/>" +
                  "  <Protection/>  </Style>  " +
                  "<Style ss:ID=/"BoldColumn/">  <Font " +
                  "x:Family=/"Swiss/" ss:Bold=/"1/"/>  </Style>  " +
                  "<Style     ss:ID=/"StringLiteral/">  <NumberFormat" +
                  " ss:Format=/"@/"/>  </Style>  <Style " +
                  "ss:ID=/"Decimal/">  <NumberFormat " +
                  "ss:Format=/"0.0000/"/>  </Style>  " +
                  "<Style ss:ID=/"Integer/">  <NumberFormat " +
                  "ss:Format=/"0/"/>  </Style>  <Style " +
                  "ss:ID=/"DateLiteral/">  <NumberFormat " +
                  "ss:Format=/"mm/dd/yyyy;@/"/>  </Style>  " +
                  "</Styles>  ";
            const string endExcelXML = "</Workbook>";
            int rowCount = 0;
            int sheetCount = 1;
            excelDoc.Write(startExcelXML);
            excelDoc.Write("<Worksheet ss:Name=/"Sheet" + sheetCount + "/">");
            excelDoc.Write("<Table>");
            excelDoc.Write("<Row>");
            for (int x = 0; x < source.Columns.Count; x++)
            {
                excelDoc.Write("<Cell ss:StyleID=/"BoldColumn/"><Data ss:Type=/"String/">");
                excelDoc.Write(source.Columns[x].ColumnName);
                excelDoc.Write("</Data></Cell>");
            }
            excelDoc.Write("</Row>");
            foreach (DataRow x in source.Rows)
            {
                rowCount++;
                //if the number of rows is > 64000 create a new page to continue output
                if (rowCount == 64000)
                {
                    rowCount = 0;
                    sheetCount++;
                    excelDoc.Write("</Table>");
                    excelDoc.Write(" </Worksheet>");
                    excelDoc.Write("<Worksheet ss:Name=/"Sheet" + sheetCount + "/">");
                    excelDoc.Write("<Table>");
                }
                excelDoc.Write("<Row>"); //ID=" + rowCount + "
                for (int y = 0; y < source.Columns.Count; y++)
                {
                    System.Type rowType;
                    rowType = x[y].GetType();
                    switch (rowType.ToString())
                    {
                        case "System.String":
                            string XMLstring = x[y].ToString();
                            XMLstring = XMLstring.Trim();
                            XMLstring = XMLstring.Replace("&", "&");
                            XMLstring = XMLstring.Replace(">", ">");
                            XMLstring = XMLstring.Replace("<", "<");
                            excelDoc.Write("<Cell ss:StyleID=/"StringLiteral/">" +
                                           "<Data ss:Type=/"String/">");
                            excelDoc.Write(XMLstring);
                            excelDoc.Write("</Data></Cell>");
                            break;
                        case "System.DateTime":
                            //Excel has a specific Date Format of YYYY-MM-DD followed by  
                            //the letter 'T' then hh:mm:sss.lll Example 2005-01-31T24:01:21.000
                            //The Following Code puts the date stored in XMLDate 
                            //to the format above
                            DateTime XMLDate = (DateTime)x[y];
                            string XMLDatetoString = ""; //Excel Converted Date
                            XMLDatetoString = XMLDate.Year.ToString() +
                                 "-" +
                                 (XMLDate.Month < 10 ? "0" +
                                 XMLDate.Month.ToString() : XMLDate.Month.ToString()) +
                                 "-" +
                                 (XMLDate.Day < 10 ? "0" +
                                 XMLDate.Day.ToString() : XMLDate.Day.ToString()) +
                                 "T" +
                                 (XMLDate.Hour < 10 ? "0" +
                                 XMLDate.Hour.ToString() : XMLDate.Hour.ToString()) +
                                 ":" +
                                 (XMLDate.Minute < 10 ? "0" +
                                 XMLDate.Minute.ToString() : XMLDate.Minute.ToString()) +
                                 ":" +
                                 (XMLDate.Second < 10 ? "0" +
                                 XMLDate.Second.ToString() : XMLDate.Second.ToString()) +
                                 ".000";
                            excelDoc.Write("<Cell ss:StyleID=/"DateLiteral/">" +
                                         "<Data ss:Type=/"DateTime/">");
                            excelDoc.Write(XMLDatetoString);
                            excelDoc.Write("</Data></Cell>");
                            break;
                        case "System.Boolean":
                            excelDoc.Write("<Cell ss:StyleID=/"StringLiteral/">" +
                                        "<Data ss:Type=/"String/">");
                            excelDoc.Write(x[y].ToString());
                            excelDoc.Write("</Data></Cell>");
                            break;
                        case "System.Int16":
                        case "System.Int32":
                        case "System.Int64":
                        case "System.Byte":
                            excelDoc.Write("<Cell ss:StyleID=/"Integer/">" +
                                    "<Data ss:Type=/"Number/">");
                            excelDoc.Write(x[y].ToString());
                            excelDoc.Write("</Data></Cell>");
                            break;
                        case "System.Decimal":
                        case "System.Double":
                            excelDoc.Write("<Cell ss:StyleID=/"Decimal/">" +
                                  "<Data ss:Type=/"Number/">");
                            excelDoc.Write(x[y].ToString());
                            excelDoc.Write("</Data></Cell>");
                            break;
                        case "System.DBNull":
                            excelDoc.Write("<Cell ss:StyleID=/"StringLiteral/">" +
                                  "<Data ss:Type=/"String/">");
                            excelDoc.Write("");
                            excelDoc.Write("</Data></Cell>");
                            break;
                        default:
                            throw (new Exception(rowType.ToString() + " not handled."));
                    }
                }
                excelDoc.Write("</Row>");
            }
            excelDoc.Write("</Table>");
            excelDoc.Write(" </Worksheet>");
            excelDoc.Write(endExcelXML);
            excelDoc.Close();
        }
    }
}


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