FileHelpers 用法 z

用FileHelplers导出csv数据：

[DelimitedRecord(",")]
[IgnoreEmptyLines()]
[ConditionalRecord(RecordCondition.ExcludeIfMatchRegex, "^,+$")]
public class FormItemExport
{
[FieldQuoted(‘"’, QuoteMode.OptionalForBoth)]
[FieldNullValue(typeof(string), "")]
public string Id;

[FieldQuoted(‘"’, QuoteMode.OptionalForBoth)]
[FieldNullValue(typeof(string), "")]
public string FirstName;

[FieldQuoted(‘"’, QuoteMode.OptionalForBoth)]
[FieldNullValue(typeof(string), "")]
public string LastName;

[FieldQuoted(‘"’, QuoteMode.OptionalForBoth)]
[FieldNullValue(typeof(string), "")]
public string Email;

[FieldQuoted(‘"’, QuoteMode.OptionalForBoth)]
[FieldNullValue(typeof(string), "")]
public string RewardsCardHolder;

[FieldQuoted(‘"’, QuoteMode.OptionalForBoth)]
[FieldNullValue(typeof(string), "")]
public string CreateDatetime;

}

public class Utils
{
public delegate V ExportFill<T, V>(T inptOj);

public static FormItemExport FillForm(WscLandingFormEntity le)
{
FormItemExport lre = new FormItemExport();

lre.Id = le.Id.ToString();
lre.FirstName = le.FirstName;
lre.LastName = le.LastName;
lre.Email = le.Email;

if (le.RewardsCardHolder)
{
lre.RewardsCardHolder = "Yes";
}
else
{
lre.RewardsCardHolder = "No";
}

lre.CreateDatetime = le.CreateDatetime.ToString("MM/dd/yyyy hh:mm:ss");

return lre;
}

public static void Export<T, V>(EntityCollectionBase<T> ec, ExportFill<T, V> expF, string filename, string[] fieldsHeaders) where T : EntityBase
{
string delimiter = ",";
string qualifier = """;

List<V> recordCollection = new List<V>();
foreach (T obj in ec)
{
recordCollection.Add(expF(obj));
}

MemoryStream ms = new MemoryStream();
StreamWriter sw = new StreamWriter(ms);
ms.Position = 0;

FileHelperEngine engine = new FileHelperEngine(typeof(V));
V[] erc = recordCollection.ToArray();

StringBuilder strOut = new StringBuilder();

for (int i = 0; i < fieldsHeaders.Length; i++)
{
strOut.Append(qualifier);
strOut.Append(fieldsHeaders[i]);
strOut.Append(qualifier);
if (i < fieldsHeaders.Length – 1)
strOut.Append(delimiter);
}

engine.HeaderText = strOut.ToString();
engine.WriteStream(sw, erc);

HttpResponse response = HttpContext.Current.Response;
response.Clear();
response.AddHeader("content-disposition", "attachment; filename=" + filename);
response.ContentType = "application/vnd.ms-excel";

sw.Flush();
ms.Flush();
ms.WriteTo(response.OutputStream);

ms.Close();
response.Flush();
response.End();
}
}

导出时：

Utils.Export < MclCommercialContactEntity, CommercialContactExport>
 (list,new Utils.ExportFill<MclCommercialContactEntity,CommercialContactExport>(CommercialContactExport.ExportCommercialContacts), "Commercial Contacts.csv",
new string[] { "Organization", "First Name", "Last Name", "Address", "City", "Province", "Country", "Postal Code", "Phone Number", "Alternate Phone", "Email" });