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class ExportToExcel
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{
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public void SaveExcel(DataTable dt, string Filter, string FileName, string SheetName)
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{
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if (FileName == "")
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{
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SaveFileDialog a = new SaveFileDialog();
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a.Filter = "Excel 工作簿 (*.xls)|*.xls";
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if (a.ShowDialog() == DialogResult.OK)
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{
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FileName = a.FileName;
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}
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else
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{
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return;
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}
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}
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try
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{
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System.IO.File.Delete(FileName);
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}
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catch (Exception)
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{
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MessageBox.Show("该文件已经存在,删除文件时出错!", "错误", MessageBoxButtons.OK, MessageBoxIcon.Error);
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return;
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}
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string ConnStr;
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ConnStr = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=\"" + FileName + "\";Extended Properties=\"Excel 8.0;HDR=YES\"";
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OleDbConnection conn_excel = new OleDbConnection();
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conn_excel.ConnectionString = ConnStr;
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OleDbCommand cmd_excel = new OleDbCommand();
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string sql;
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sql = SqlCreate(dt, SheetName);
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conn_excel.Open();
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cmd_excel.Connection = conn_excel;
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cmd_excel.CommandText = sql;
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cmd_excel.ExecuteNonQuery();
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conn_excel.Close();
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OleDbDataAdapter da_excel = new OleDbDataAdapter("Select * From [" + SheetName + "$]", conn_excel);
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DataTable dt_excel = new DataTable();
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da_excel.Fill(dt_excel);
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da_excel.InsertCommand = SqlInsert(SheetName, dt, conn_excel);
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DataRow dr_excel;
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string ColumnName;
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foreach (DataRow dr in dt.Select(Filter))
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{
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dr_excel = dt_excel.NewRow();
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foreach (DataColumn dc in dt.Columns)
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{
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ColumnName = dc.ColumnName;
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dr_excel[ColumnName] = dr[ColumnName];
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}
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dt_excel.Rows.Add(dr_excel);
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}
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da_excel.Update(dt_excel);
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conn_excel.Close();
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if (MessageBox.Show("数据成功导出到『" + FileName + "』,是否现在打开?", "导出",
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MessageBoxButtons.YesNo, MessageBoxIcon.Question) == DialogResult.Yes)
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{
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System.Diagnostics.Process.Start(FileName);
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}
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}
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private void CheckColumn(DataTable dt, DataTable dt_v)
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{
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foreach (DataRow dr in dt_v.Select())
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{
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if (!dt.Columns.Contains(dr["列名"].ToString()))
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{
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dr.Delete();
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}
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}
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dt_v.AcceptChanges();
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}
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private string GetDataType(Type i)
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{
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string s;
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switch (i.Name)
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{
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case "String":
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s = "Char";
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break;
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case "Int32":
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s = "Int";
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break;
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case "Int64":
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s = "Int";
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break;
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case "Int16":
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s = "Int";
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break;
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case "Double":
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s = "Double";
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break;
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case "Decimal":
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s = "Double";
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break;
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default:
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s = "Char";
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break;
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}
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return s;
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}
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private OleDbType StringToOleDbType(Type i)
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{
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OleDbType s;
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switch (i.Name)
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{
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case "String":
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s = OleDbType.Char;
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break;
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case "Int32":
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s = OleDbType.Integer;
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break;
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case "Int64":
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s = OleDbType.Integer;
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break;
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case "Int16":
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s = OleDbType.Integer;
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break;
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case "Double":
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s = OleDbType.Double;
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break;
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case "Decimal":
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s = OleDbType.Decimal;
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break;
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default:
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s = OleDbType.Char;
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break;
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}
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return s;
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}
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private string SqlCreate(DataTable dt, string SheetName)
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{
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string sql;
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sql = "CREATE TABLE " + SheetName + " (";
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foreach (DataColumn dc in dt.Columns)
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{
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sql += "[" + dc.ColumnName + "] " + GetDataType(dc.DataType) + " ,";
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}
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//sql = "CREATE TABLE [" + SheetName + "] (";
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//foreach (C1.Win.C1TrueDBGrid.C1DataColumn dc in grid.Columns)
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//{
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// sql += "[" + dc.Caption + "] " + GetDataType(dc.DataType) + ",";
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//}
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//sql = sql.Substring(0, sql.Length - 1);
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//sql += ")";
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sql = sql.Substring(0, sql.Length - 1);
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sql += ")";
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return sql;
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}
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// 生成 InsertCommand 并设置参数
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private OleDbCommand SqlInsert(string SheetName, DataTable dt, OleDbConnection conn_excel)
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{
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OleDbCommand i;
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string sql;
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sql = "INSERT INTO [" + SheetName + "$] (";
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foreach (DataColumn dc in dt.Columns)
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{
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sql += "[" + dc.ColumnName + "] ";
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sql += ",";
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}
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sql = sql.Substring(0, sql.Length - 1);
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sql += ") VALUES (";
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foreach (DataColumn dc in dt.Columns)
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{
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sql += "?,";
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}
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sql = sql.Substring(0, sql.Length - 1);
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sql += ")";
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i = new OleDbCommand(sql, conn_excel);
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foreach (DataColumn dc in dt.Columns)
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{
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i.Parameters.Add("@" + dc.Caption, StringToOleDbType(dc.DataType), 0, dc.Caption);
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}
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return i;
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}
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}
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