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C#中导入和导出Excel的方法

2013-06-19 16:12 435 查看

using System.Data;
using System.Data.OleDb;
/// <summary>
/// Excel转为DataTable
/// </summary>
/// <param name="ExcelName"></param>
/// <returns></returns>
public static DataTable ExcelToDataTable(string filePath)
{
string strCon = "Provider = Microsoft.ACE.OLEDB.12.0 ;Data Source=" + filePath + ";Extended Properties='Excel 12.0;HDR=YES;'";// IMEX=1为导入模式
OleDbConnection olecon = new OleDbConnection(strCon);
olecon.Open();
DataTable dt = olecon.GetOleDbSchemaTable(OleDbSchemaGuid.Tables, new Object[] { null, null, null, "TABLE" });
string sheetName = dt.Rows[0]["TABLE_NAME"].ToString();//获取Excel表名
OleDbDataAdapter myda = new OleDbDataAdapter("SELECT * FROM [" + sheetName + "]", strCon);
DataTable mydt = new DataTable();
myda.Fill(mydt);
olecon.Close();
return mydt;
}

/// <summary>
/// DataTable导出Excel
/// GridView作为中间数据格式转换用途
/// </summary>
/// <param name="page">Page对象</param>
/// <param name="columns">导出数据源</param>
/// <param name="dt">导出显示列与对应数据列，Key:Excel列名，Value:数据源列名</param>
/// <param name="fileName">导出文件名，无需带后缀</param>
public static void GridViewToExcel(Page page, DataTable dt, Dictionary<string, string> columns, string fileName)
{
if (page == null || dt == null || dt.Rows.Count <= 0 || columns == null || columns.Count <= 0)
{
return;
}

if (string.IsNullOrEmpty(fileName.Trim()))
{
fileName = "DataToExcel";
}

DataTable temp = new DataTable();

foreach (KeyValuePair<string, string> item in columns)
{
temp.Columns.Add(item.Key);
}

foreach (DataRow dr in dt.Rows)
{
DataRow drs = temp.NewRow();

foreach (KeyValuePair<string, string> item in columns)
{
drs[item.Key] = dr[item.Value];
}
temp.Rows.Add(drs);
}

GridView gv = new GridView();
gv.DataSource = temp;
gv.AllowPaging = false;
gv.EnableViewState = false;
gv.DataBind();

StringWriter strWriter = new StringWriter();
HtmlTextWriter htmlWriter = new HtmlTextWriter(strWriter);

page.Response.Clear();
page.Response.Buffer = true;
page.Response.Charset = "GB2312";
page.Response.HeaderEncoding = System.Text.Encoding.GetEncoding("GB2312");
page.Response.ContentEncoding = System.Text.Encoding.GetEncoding("GB2312");
page.Response.AppendHeader("Content-Disposition", "attachment;filename=" + fileName + ".xls");
page.Response.ContentType = "application/ms-excel";
gv.RenderControl(htmlWriter);
page.Response.Write(strWriter.ToString());
page.Response.End();
}

/// <summary>
/// DataTable导出Excel，自定义Html Table格式
/// </summary>
/// <param name="page">Page对象</param>
/// <param name="dt">DataTable</param>
/// <param name="columns">导出显示列与对应数据列，Key:Excel导出列名，Value:数据源列名</param>
/// <param name="fileName">导出文件名，无需带后缀</param>
public static void ToExcel(Page page, DataTable dt1, Dictionary<string, string> columns, string fileName)
{

if (page == null || dt1 == null || dt1.Rows.Count <= 0 || columns == null || columns.Count <= 0)
{
return;
}

if (string.IsNullOrEmpty(fileName.Trim()))
{
fileName = "DataToExcel";
}
page.Response.Clear();
page.Response.Buffer = true;
page.Response.Charset = "GB2312";
page.Response.HeaderEncoding = System.Text.Encoding.GetEncoding("GB2312");
page.Response.ContentEncoding = System.Text.Encoding.GetEncoding("GB2312");
page.Response.ContentType = "application/ms-excel";
page.Response.AppendHeader("Content-Disposition", "attachment;filename=" + fileName + ".xls");

System.Text.StringBuilder builder = new System.Text.StringBuilder();
builder.Append("<html xmlns:x=\"urn><head>\n");
builder.Append("<meta http-equiv=\"Content-Language\" content=\"zh-cn\"><meta http-equiv=\"Content-Type\" content=\"text/html;charset=gb2312\"></head>");
builder.Append("<table border=1 style=\"vnd.ms-excel.numberformat:@\"><tr>");

foreach (KeyValuePair<string, string> item in columns)
{
builder.Append("<th>" + item.Key + "</th>");
}

builder.Append("</tr>");

foreach (DataRow item in dt1.Rows)
{
builder.Append("<tr>");
foreach (KeyValuePair<string, string> kv in columns)
{
if (IsDateTime(item[kv.Value].ToString()))
builder.Append("<td style=\"vnd.ms-excel.numberformat:yyyy-MM-dd\">" + item[kv.Value] + "</td>");
else
builder.Append("<td>" + item[kv.Value] + "</td>");
}
builder.Append("</tr>");
}
builder.Append("</table>");
page.Response.Write(builder.ToString());
page.Response.Flush();
page.Response.End();
}

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