![](https://images.cnblogs.com/OutliningIndicators/ContractedBlock.gif)
![](https://images.cnblogs.com/OutliningIndicators/ContractedBlock.gif)
/// <summary>
/// Export to Csv File from dataset
/// </summary>
/// <param name="src"></param>
/// <param name="folderName">folderName</param>
/// <param name="strFileName">strFileName</param>
/// <returns></returns>
public bool ExportToCsv(DataSet src, string folderName, string strFileName)
{
string csv = String.Empty;
StreamWriter writer = null;
string fileName = Server.MapPath("/") + folderName + "\\" + strFileName;
try
{
if (src == null || src.Tables.Count == 0) throw new Exception("dataset is null or has not table in dataset");
for (int i = 0; i < src.Tables.Count; i++)
{
if (i > 0)
fileName = fileName.Substring(0, fileName.IndexOf('.')) + i + fileName.Substring(fileName.IndexOf("."));
writer = new StreamWriter(fileName);
DataTable dt = src.Tables[i];
StringBuilder sb = new StringBuilder();
for (int j = 0; j < dt.Columns.Count; j++)
{
string colName = dt.Columns[j].ColumnName;
if (colName.IndexOf(',') > -1)
colName = colName.Insert(0, "\"").Insert(colName.Length + 1, "\"");
sb.Append(colName);
if (!colName.Equals(""))
if (j != dt.Columns.Count - 1)
sb.Append(",");
}
writer.WriteLine(sb.ToString());
sb = new StringBuilder();
string temp = "";
for (int j = 0; j < dt.Rows.Count; j++)
{
DataRow dr = dt.Rows[j];
for (int k = 0; k < dt.Columns.Count; k++)
{
object o = dr[k];
if (o != null)
temp = o.ToString();
if (temp.IndexOf(',') > -1)
temp = temp.Insert(0, "\"").Insert(temp.Length + 1, "\"");
sb.Append(temp);
if (k != dt.Columns.Count - 1)
sb.Append(",");
}
writer.WriteLine(sb.ToString());
sb = new StringBuilder();
csv = sb.ToString();
}
writer.Close();
}
string strFilePath = Server.MapPath("/") + folderName;
if (!Directory.Exists(strFilePath))
{
Directory.CreateDirectory(strFilePath);
}
strFullFileName = Server.MapPath("/") + folderName + "\\" + fileName;
//FullFileName = Server.MapPath(FileName);
//FileName
FileInfo DownloadFile = new FileInfo(strFullFileName);
if (DownloadFile.Exists)
{
Response.Clear();
Response.ClearHeaders();
Response.Buffer = false;
Response.ContentType = "application/octet-stream";
//Response.AppendHeader("Content-Disposition", "attachment;filename=" + HttpUtility.UrlEncode(DownloadFile.FullName, System.Text.Encoding.ASCII));
Response.AppendHeader("Content-Disposition", "attachment;filename=" + HttpUtility.UrlEncode(fileName, System.Text.Encoding.ASCII));
Response.AppendHeader("Content-Length", DownloadFile.Length.ToString());
Response.WriteFile(DownloadFile.FullName);
Response.Flush();
//Response.End();
}
else
{
//not exist
throw new Exception("Export csv file does not exist!");
}
}
catch (Exception ex)
{
throw new Exception("Save csv error", ex);
}
finally
{
if (writer != null) writer.Close();
}
return true;
}
/// <summary>
/// List to DataTable
/// </summary>
/// <param name="entitys">entitys list</param>
/// <returns></returns>
public DataTable ListToDataTable(List<T> entitys)
{
//
if (entitys == null || entitys.Count < 1)
{
throw new Exception("list is null");
}
//get first Propertie
Type entityType = entitys[0].GetType();
PropertyInfo[] entityProperties = entityType.GetProperties();
//DataTable structure
//
DataTable dt = new DataTable();
for (int i = 0; i < entityProperties.Length; i++)
{
//dt.Columns.Add(entityProperties[i].Name, entityProperties[i].PropertyType);
dt.Columns.Add(entityProperties[i].Name);
}
//add entity to DataTable
foreach (object entity in entitys)
{
//check type
if (entity.GetType() != entityType)
{
throw new Exception("type not same");
}
object[] entityValues = new object[entityProperties.Length];
for (int i = 0; i < entityProperties.Length; i++)
{
entityValues[i] = entityProperties[i].GetValue(entity, null);
}
dt.Rows.Add(entityValues);
}
return dt;
}
/// Export to Csv File from dataset
/// </summary>
/// <param name="src"></param>
/// <param name="folderName">folderName</param>
/// <param name="strFileName">strFileName</param>
/// <returns></returns>
public bool ExportToCsv(DataSet src, string folderName, string strFileName)
{
string csv = String.Empty;
StreamWriter writer = null;
string fileName = Server.MapPath("/") + folderName + "\\" + strFileName;
try
{
if (src == null || src.Tables.Count == 0) throw new Exception("dataset is null or has not table in dataset");
for (int i = 0; i < src.Tables.Count; i++)
{
if (i > 0)
fileName = fileName.Substring(0, fileName.IndexOf('.')) + i + fileName.Substring(fileName.IndexOf("."));
writer = new StreamWriter(fileName);
DataTable dt = src.Tables[i];
StringBuilder sb = new StringBuilder();
for (int j = 0; j < dt.Columns.Count; j++)
{
string colName = dt.Columns[j].ColumnName;
if (colName.IndexOf(',') > -1)
colName = colName.Insert(0, "\"").Insert(colName.Length + 1, "\"");
sb.Append(colName);
if (!colName.Equals(""))
if (j != dt.Columns.Count - 1)
sb.Append(",");
}
writer.WriteLine(sb.ToString());
sb = new StringBuilder();
string temp = "";
for (int j = 0; j < dt.Rows.Count; j++)
{
DataRow dr = dt.Rows[j];
for (int k = 0; k < dt.Columns.Count; k++)
{
object o = dr[k];
if (o != null)
temp = o.ToString();
if (temp.IndexOf(',') > -1)
temp = temp.Insert(0, "\"").Insert(temp.Length + 1, "\"");
sb.Append(temp);
if (k != dt.Columns.Count - 1)
sb.Append(",");
}
writer.WriteLine(sb.ToString());
sb = new StringBuilder();
csv = sb.ToString();
}
writer.Close();
}
string strFilePath = Server.MapPath("/") + folderName;
if (!Directory.Exists(strFilePath))
{
Directory.CreateDirectory(strFilePath);
}
strFullFileName = Server.MapPath("/") + folderName + "\\" + fileName;
//FullFileName = Server.MapPath(FileName);
//FileName
FileInfo DownloadFile = new FileInfo(strFullFileName);
if (DownloadFile.Exists)
{
Response.Clear();
Response.ClearHeaders();
Response.Buffer = false;
Response.ContentType = "application/octet-stream";
//Response.AppendHeader("Content-Disposition", "attachment;filename=" + HttpUtility.UrlEncode(DownloadFile.FullName, System.Text.Encoding.ASCII));
Response.AppendHeader("Content-Disposition", "attachment;filename=" + HttpUtility.UrlEncode(fileName, System.Text.Encoding.ASCII));
Response.AppendHeader("Content-Length", DownloadFile.Length.ToString());
Response.WriteFile(DownloadFile.FullName);
Response.Flush();
//Response.End();
}
else
{
//not exist
throw new Exception("Export csv file does not exist!");
}
}
catch (Exception ex)
{
throw new Exception("Save csv error", ex);
}
finally
{
if (writer != null) writer.Close();
}
return true;
}
/// <summary>
/// List to DataTable
/// </summary>
/// <param name="entitys">entitys list</param>
/// <returns></returns>
public DataTable ListToDataTable(List<T> entitys)
{
//
if (entitys == null || entitys.Count < 1)
{
throw new Exception("list is null");
}
//get first Propertie
Type entityType = entitys[0].GetType();
PropertyInfo[] entityProperties = entityType.GetProperties();
//DataTable structure
//
DataTable dt = new DataTable();
for (int i = 0; i < entityProperties.Length; i++)
{
//dt.Columns.Add(entityProperties[i].Name, entityProperties[i].PropertyType);
dt.Columns.Add(entityProperties[i].Name);
}
//add entity to DataTable
foreach (object entity in entitys)
{
//check type
if (entity.GetType() != entityType)
{
throw new Exception("type not same");
}
object[] entityValues = new object[entityProperties.Length];
for (int i = 0; i < entityProperties.Length; i++)
{
entityValues[i] = entityProperties[i].GetValue(entity, null);
}
dt.Rows.Add(entityValues);
}
return dt;
}