C#导入和导出CSV文件
一、手工导出导出
1、winform
void DataGridViewToExcel(DataGridView dataGridView1) { SaveFileDialog saveFileDialog = new SaveFileDialog(); saveFileDialog.Filter = "Execl files (*.xls)|*.xls"; saveFileDialog.FilterIndex = 0; saveFileDialog.RestoreDirectory = true; saveFileDialog.CreatePrompt = true; saveFileDialog.Title = "保存为Excel文件"; if (saveFileDialog.ShowDialog() == DialogResult.OK) { Stream stream = saveFileDialog.OpenFile(); StreamWriter sw = new StreamWriter(stream, System.Text.Encoding.GetEncoding(-0)); string columnTitle = ""; try { for (int i = 0; i < dataGridView1.ColumnCount; i++) { if (i > 0) { columnTitle += "\t";//或者为逗号 } columnTitle += dataGridView1.Columns[i].HeaderText;//写入列标题 } sw.WriteLine(columnTitle); for (int j = 0; j < dataGridView1.Rows.Count; j++) { string columnValue = ""; for (int k = 0; k < dataGridView1.Columns.Count; k++) { if (k > 0) { columnValue += "\t"; } columnValue += dataGridView1.Rows[j].Cells[k].Value.ToString(); } sw.WriteLine(columnValue); } sw.Close(); stream.Close(); } finally { sw.Close(); stream.Close(); } } }
2、Web导出
不用存磁盘文件<iframe>导出。
string exportFileName = "Export" + DateTime.Now.ToString("yyyyMMddHHmmss"); System.Web.HttpContext context = System.Web.HttpContext.Current; StringBuilder sb = new StringBuilder(); sb.Append("FirstName,LastName,PhoneNo.,State,TimeZone,ZipCode\n"); for (int i = 0; i < result.PhoneList.Count; i++) { sb.Append(result.PhoneList[i].FirstName + "," + result.PhoneList[i].LastName + "," + result.PhoneList[i].ZipCode + "\n"); } StringWriter sw = new StringWriter(sb);//一定要StringWriter/StreamWriter才能直接导出 sw.Close(); context.Response.ClearHeaders(); context.Response.Clear(); context.Response.Charset = "UTF-8"; context.Response.ContentEncoding = System.Text.Encoding.UTF8; context.Response.HeaderEncoding = System.Text.Encoding.UTF8; context.Response.ContentType = "text/csv"; context.Response.BinaryWrite(new byte[] { 0xEF, 0xBB, 0xBF });//防止中文乱码 context.Response.Write(sw); context.Response.AppendHeader("content-disposition", "attachment; filename=" + HttpUtility.UrlEncode("1.csv", System.Text.Encoding.UTF8).Replace("+", "%20")); sw.Close(); context.Response.Flush(); context.Response.End();
二、利用LumenWorks.Framework.IO.Csv读取CSV文件
需要引用LumenWorks.Framework.IO.dll,读取的时候编码格式要选对,否则会乱码,表头自己设置
- phatcher/CsvReader: Extended version of Sebastian Lorien's fast CSV Reader (github.com)
- NuGet Gallery | LumenWorksCsvReader 4.0.0
static DataTable GetData(Stream stream) { using (stream) { using (StreamReader input = new StreamReader(stream, Encoding.GetEncoding("shift_jis"))) { using (CsvReader csv = new CsvReader(input, false)) { DataTable dt = new DataTable(); int columnCount = csv.FieldCount; for (int i = 0; i < columnCount; i++) { dt.Columns.Add("col" + i.ToString()); } while (csv.ReadNextRecord()) { DataRow dr = dt.NewRow(); for (int i = 0; i < columnCount; i++) { if (!string.IsNullOrWhiteSpace(csv[i])) { dr[i] = csv[i]; } } dt.Rows.Add(dr); } return dt; } } } }
基本使用场景
using System.IO; using LumenWorks.Framework.IO.Csv; void ReadCsv() { // open the file "data.csv" which is a CSV file with headers using (CsvReader csv = new CsvReader(new StreamReader("data.csv"), true)) { int fieldCount = csv.FieldCount; string[] headers = csv.GetFieldHeaders(); while (csv.ReadNextRecord()) { for (int i = 0; i < fieldCount; i++) Console.Write(string.Format("{0} = {1};", headers[i], csv[i])); Console.WriteLine(); } } }
复杂的数据绑定方案(Windows窗体)
using System.IO; using LumenWorks.Framework.IO.Csv; void ReadCsv() { // open the file "data.csv" which is a CSV file with headers using (CachedCsvReader csv = new CachedCsvReader(new StreamReader("data.csv"), true)) { // Field headers will automatically be used as column names myDataGrid.DataSource = csv; } }
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