Npoi large Data volume multiple sheet export Source (original)

#region npoi Large Data volume multiple sheet export

<summary>
Large data volume multiple sheet export
</summary>
<typeparam name= "T" > Data source entity class </typeparam>
<param name= "objlist" > Data source </param>
<param name= "FileName" > File name </param>
<param name= "Btybytes" > Export Data Flow </param>
<param name= "Columninfo" > display column corresponding data dictionary </param>
<param name= "ListCount" > Each sheet contains the number of data bars </param>
<returns></returns>
public static bool Exportexceltest<t> (List<t> objlist, string fileName, ref byte[] Btybytes, dictionary< String, string> columninfo = Null,int listcount=10000)
{
BOOL Bresult = false;
Generate an Excel file in memory:
Hssfworkbook book = new Hssfworkbook ();
if (objlist! = null && objlist.count > 0)
{
Double Sheetcount = math.ceiling ((double) objlist.count/listcount);
for (int i = 0; i < Sheetcount; i++)
{
Isheet sheet = null;
Sheet = Book. Createsheet ("sheet" + i);
Sheet. Defaultrowheight = 20 * 10;
list<t> list = new list<t> ();
List = objlist.skip<t> (ListCount * i). Take<t> (ListCount). ToList ();

int rowIndex = 0;
int startcolindex = 0;
int colindex = Startcolindex;

To create a table header style
Icellstyle style = Book. Createcellstyle ();
Style. Alignment = HorizontalAlignment.Center;
Style. WrapText = true;
IFont font = Book. CreateFont ();
Font. fontheightinpoints = 16;
Font. Boldweight = (short) npoi. Ss. UserModel.FontBoldWeight.Bold;
Font. FontName = "Simplified Chinese";
Style. SetFont (font);//head style

Type myType = null;
MyType = objlist[0]. GetType ();
Gets the properties to display based on the property name information passed in from the reflection
list<propertyinfo> Mypro = new list<propertyinfo> ();
Propertyinfo[] Properties = mytype.getproperties ();

#region Defining a table header
int m = 0;
if (columninfo! = null)
{
var rowheader = sheet. CreateRow (0);
Rowheader. Height = Rowheader. Height = 20 * 20;
foreach (String cName in Columninfo.keys)
{
PropertyInfo p = mytype.getproperty (cName);
if (P! = null)
{
Mypro.add (P);
Rowheader. Createcell (M). Setcellvalue (Columninfo[cname]);
m++;
}
}
}
#endregion
#region Define a table body and assign values
End If no available attributes are found
if (Mypro.count = = 0) {return bresult;}
foreach (T obj in list)
{
int n = 0;
if (sheet! = null)
{
rowindex++;
var sheetrow = sheet. CreateRow (RowIndex);
Sheetrow. Height = Sheetrow. Height = 20 * 20;
foreach (PropertyInfo p in Mypro)
{
Dynamic val = p.getvalue (obj, null)?? "";
String Valtype = val. GetType (). ToString ();
if (Valtype. ToLower (). IndexOf ("decimal", stringcomparison.ordinal) >-1)
{
val = convert.todouble (val);
}
else if (valtype. ToLower (). IndexOf ("datetime", StringComparison.Ordinal) >-1)
{
val = val. ToString ("Yyyy-mm-dd HH:mm:ss");
if (Val. Equals ("0001-01-01 00:00:00"))
{
val = "";
}
}
Sheetrow. Createcell (n). Setcellvalue (Val);
n++;
}
}

}
#endregion
}
}
Else
{
Create a worksheet in a workbook
Hssfsheet sheet = Book. Createsheet () as Hssfsheet;
Sheet. Setcolumnwidth (0, 30 * 256);
if (sheet! = null) sheet. CreateRow (0). Createcell (0). Setcellvalue ("No data! ");
}

Try
{
HttpResponse rs = System.Web.HttpContext.Current.Response;
Rs. ContentEncoding = System.Text.Encoding.GetEncoding ("GB2312");
Rs. Appendheader ("Content-disposition", "attachment;filename=" + filename);
Rs. ContentType = "Application/ms-excel";
using (MemoryStream ms = new MemoryStream ())
{
Book. Write (MS);
Rs. BinaryWrite (Ms. ToArray ());
Ms. Flush ();
}
}
catch (SystemException ex)
{
Loghelper.write (ex);
}
catch (ApplicationException ex)
{
Loghelper.write (ex);
}
return bresult;
}


#endregion

Npoi large Data volume multiple sheet export Source (original)