将表列表导出为CSV文件

我试图将表的列表导出为逗号分隔值（CSV）。但是没有得到正确的输出。来自此代码的输出是以html表的forms。 这是我的代码，帮帮我….谢谢

public void ExportToCsv() { DataClassesDataContext db = new DataClassesDataContext(); var employee = db.Employees.ToList(); var grid = new System.Web.UI.WebControls.GridView(); grid.DataSource = employee; grid.DataBind(); StringBuilder strbldr = new StringBuilder(); for (int i = 0; i < grid.Columns.Count; i++) { strbldr.Append(grid.Columns[i].HeaderText + ','); } for (int j = 0; j < grid.Rows.Count; j++) { for (int k = 0; k < grid.Columns.Count; k++) { //separating gridview columns with comma strbldr.Append(grid.Rows[j].Cells[k].Text + ','); } //appending new line for gridview rows strbldr.Append("\n"); } Response.Clear(); Response.ClearHeaders(); Response.ClearContent(); Response.AddHeader("content-disposition", "attachment; filename=YourFileName.csv"); Response.ContentType = "text/csv"; StringWriter sa = new StringWriter(strbldr); HtmlTextWriter ht = new HtmlTextWriter(sa); grid.RenderControl(ht); Response.Write(sa.ToString()); Response.End(); } 

Answer 1

我认为首先使用下面的代码将列表转换为数据表

 public static DataTable ToDataTable(List l_oItems) { DataTable oReturn = new DataTable(typeof(T).Name); object[] a_oValues; int i; //#### Collect the a_oProperties for the passed T PropertyInfo[] a_oProperties = typeof(T).GetProperties(BindingFlags.Public | BindingFlags.Instance); //#### Traverse each oProperty, .Add'ing each .Name/.BaseType into our oReturn value //#### NOTE: The call to .BaseType is required as DataTables/DataSets do not support nullable types, so it's non-nullable counterpart Type is required in the .Column definition foreach (PropertyInfo oProperty in a_oProperties) { oReturn.Columns.Add(oProperty.Name, BaseType(oProperty.PropertyType)); } //#### Traverse the l_oItems foreach (T oItem in l_oItems) { //#### Collect the a_oValues for this loop a_oValues = new object[a_oProperties.Length]; //#### Traverse the a_oProperties, populating each a_oValues as we go for (i = 0; i < a_oProperties.Length; i++) { a_oValues[i] = a_oProperties[i].GetValue(oItem, null); } //#### .Add the .Row that represents the current a_oValues into our oReturn value oReturn.Rows.Add(a_oValues); } //#### Return the above determined oReturn value to the caller return oReturn; } private static Type BaseType(Type oType) { //#### If the passed oType is valid, .IsValueType and is logicially nullable, .Get(its)UnderlyingType if (oType != null && oType.IsValueType && oType.IsGenericType && oType.GetGenericTypeDefinition() == typeof(Nullable<>) ) { return Nullable.GetUnderlyingType(oType); } //#### Else the passed oType was null or was not logicially nullable, so simply return the passed oType else { return oType; } } 

然后使用下面的代码将数据表导出到csv ..

 public static string ToCSV(DataTable dataTable) { //create the stringbuilder that would hold the data StringBuilder sb = new StringBuilder(); //check if there are columns in the datatable if (dataTable.Columns.Count != 0) { //loop thru each of the columns for headers foreach (DataColumn column in dataTable.Columns) { //append the column name followed by the separator sb.Append(column.ColumnName + ","); } //append a carriage return sb.Append("\r\n"); //loop thru each row of the datatable foreach (DataRow row in dataTable.Rows) { //loop thru each column in the datatable foreach (DataColumn column in dataTable.Columns) { //get the value for the row on the specified column // and append the separator sb.Append("\"" + row[column].ToString() + "\"" + ","); } //append a carriage return sb.Append("\r\n"); } } return (sb.ToString()); } 

主要function是：这个

 DataTable dt = GeneralFunctions.ToDataTable(HereputyourlistforcovertToDataTable); if (dt != null) { if (dt.Rows.Count > 0) { Response.Clear(); Response.ClearHeaders(); Response.ClearContent(); Response.ContentType = "text/CSV"; Response.AddHeader("content-disposition", "attachment; filename=ReceivingLog.csv"); Response.Write(ToCSV(dt)); Response.End(); } }