使用ADO.net将数据导出到Excel并提供下载

参考Meyer的文章写的一个例子,原文地址
http://www.cnblogs.com/meyer/articles/6977.html

项目下载

public string DataTableToExcel(DataTable dt,string excelPath)
        
{
            
if(dt == null)
            
{
                
return "DataTable不能为空";
            }


            
int rows = dt.Rows.Count;
            
int cols = dt.Columns.Count;
            StringBuilder sb;
            
string connString;

            
if(rows == 0)
            
{
                
return "没有数据";
            }


            sb 
= new StringBuilder();
            connString 
= string.Format(ConnectionString,excelPath);

            
//生成创建表的脚本
            sb.Append("CREATE TABLE ");
            sb.Append(dt.TableName 
+ " ( ");

            
for(int i=0;i<cols;i++)
            
{
                
if(i < cols - 1)
                    sb.Append(
string.Format("{0} varchar,",dt.Columns[i].ColumnName));
                
else
                    sb.Append(
string.Format("{0} varchar)",dt.Columns[i].ColumnName));
            }


            
using(OleDbConnection objConn = new OleDbConnection(connString))
            
{
                OleDbCommand objCmd 
= new OleDbCommand();
                objCmd.Connection 
= objConn;

                objCmd.CommandText 
= sb.ToString();

                
try
                
{
                    objConn.Open();
                    objCmd.ExecuteNonQuery();
                }

                
catch(Exception e)
                
{
                    
return "在Excel中创建表失败,错误信息:" + e.Message;
                }


                
生成插入数据脚本


                
//建立插入动作的Command
                objCmd.CommandText = sb.ToString();
                OleDbParameterCollection param 
= objCmd.Parameters;

                
for(int i=0;i<cols;i++)
                
{
                    param.Add(
new OleDbParameter("@" + dt.Columns[i].ColumnName, OleDbType.VarChar));
                }


                
//遍历DataTable将数据插入新建的Excel文件中
                foreach (DataRow row in dt.Rows)
                
{    
                    
for (int i=0; i<param.Count; i++)
                    
{
                        param[i].Value 
= row[i]; 
                    }


                    objCmd.ExecuteNonQuery();
                }


                
return "数据已成功导入Excel";
            }
//end using
        }
posted @ 2005-12-15 22:21  kalman  阅读(3112)  评论(2编辑  收藏