在项目中，我们经常要遇到查询和展示内容，常用的做法是通过文本框，时间控件，按键和datagridview查询和展示内容。下面是一个常见的综合实例，并支持Excel(csv)导入导出，表格列动态调整的功能。

实例代码链接：https://download.csdn.net/download/lvxingzhe3/89436315

Excel(csv)导入到Datagridview:

        /// <summary>/// 将csv文件数据导入datagridview/// </summary>/// <param name="csvPath"></param>/// <returns></returns>public static void ImportCSV(DataGridView dgv){string filePath;OpenFileDialog openFileDialog = new OpenFileDialog();openFileDialog.Filter = "CSV files (*.csv)|*.csv";openFileDialog.FilterIndex = 0;if (openFileDialog.ShowDialog() == DialogResult.OK){filePath = openFileDialog.FileName;}else{return;}DataTable dt = new DataTable();using (StreamReader sr = new StreamReader(filePath)){string[] headers = sr.ReadLine().Split(',');string headerValue = null;foreach (string header in headers){headerValue = header.Replace("\"", "");dt.Columns.Add(headerValue);}while (!sr.EndOfStream){string[] rows = sr.ReadLine().Split(',');DataRow dr = dt.NewRow();for (int i = 0; i < headers.Length; i++){dr[i] = rows[i].Replace("\"", "");}dt.Rows.Add(dr);}}dgv.DataSource = dt;}

Datagridview导出到excel(csv)

        /// <summary>/// DateGridView导出到csv格式的Excel,通用  /// </summary>/// <param name="dgv"></param>public static void ExportToCSV(DataGridView dgv){string filePath;SaveFileDialog saveFileDialog = new SaveFileDialog();saveFileDialog.Filter = "CSV files (*.csv)|*.csv";saveFileDialog.FilterIndex = 0;if (saveFileDialog.ShowDialog() == DialogResult.OK){filePath = saveFileDialog.FileName;}else{return;}using (StreamWriter sw = new StreamWriter(filePath)){// 写入列标题string headers = string.Join(",", dgv.Columns.Cast<DataGridViewColumn>().Select(column => "\"" + column.HeaderText + "\"").ToArray());sw.WriteLine(headers);// 写入数据行foreach (DataGridViewRow row in dgv.Rows){string line = string.Join(",", row.Cells.Cast<DataGridViewCell>().Select(cell => "\"" + cell.Value?.ToString().Replace("\"", "\"\"") + "\"").ToArray());sw.WriteLine(line);}}}

 实例代码链接：https://download.csdn.net/download/lvxingzhe3/89436315