[英]Which style is the better and efficiency way to export csv file
I have two solutions to export CSV file with .net MVC, which use the NuGet package named CsvHelper. 我有两种使用.net MVC导出CSV文件的解决方案,它们使用名为CsvHelper的NuGet包。
Those two solutions work the same result, but I curious which is the better one can efficient with CPU, Memory, disk io? 这两种解决方案的工作结果相同,但是我很好奇,哪一种解决方案可以更好地利用CPU,内存和磁盘io?
there's a helper with CsvHelper CsvHelper有一个助手
public static void GenerateCsv<T>(Stream stream, IEnumerable<T> data)
{
using (var sw = new StreamWriter(stream, Encoding.UTF8))
using (var writer = new CsvWriter(sw))
{
writer.WriteRecords(data);
}
}
public static byte[] WriteCsvToMemory<T>(IEnumerable<T> data)
{
using (var memoryStream = new MemoryStream())
using (var streamWriter = new StreamWriter(memoryStream))
using (var csvWriter = new CsvWriter(streamWriter))
{
csvWriter.WriteRecords(data);
streamWriter.Flush();
return memoryStream.ToArray();
}
}
first solution using Response way 使用响应方式的第一个解决方案
public void ExportDemoCsv()
{
var data = new List<Test>();
var fileName = "exportExample.csv";
Response.AppendHeader("content-disposition", "attachment;filename=" + fileName);
Response.ContentType = "text/csv";
Response.ContentEncoding = Encoding.UTF8;
Core.Helpers.CsvHelper.GenerateCsv(Response.OutputStream, data);
}
the second solution using FileContentResult and get the byte[] from helper 使用FileContentResult的第二个解决方案,并从帮助程序获取byte []
public ActionResult ExportDemoCsv()
{
var data = new List<Test>();
var csvByte = Core.Helpers.CsvHelper.WriteCsvToMemory(data);
return File(csvByte, "text/csv", "exportExample.csv");
}
It's just a question to find a way to get how to think this kind of question and how to prove two solutions 寻找一种方法来思考这种问题以及如何证明两个解决方案只是一个问题
use async would be a good idea, but how can I know the benefit. 使用异步将是一个好主意,但是我怎么知道它的好处。
Update: I write the async mode 更新:我编写了异步模式
public static async Task<byte[]> WriteCsvToMemory<T>(IEnumerable<T> data)
{
using (var memoryStream = new MemoryStream())
using (var streamWriter = new StreamWriter(memoryStream, Encoding.UTF8))
using (var csvWriter = new CsvWriter(streamWriter))
{
foreach (var record in data)
{
csvWriter.WriteRecord(record);
await csvWriter.NextRecordAsync();
}
await streamWriter.FlushAsync();
return memoryStream.ToArray();
}
}
In reference to @Christian Sauer's comment, here is an async version. 参考@Christian Sauer的评论,这是一个异步版本。
public static async Task GenerateCsv<T>(Stream stream, IEnumerable<T> data)
{
using (var sw = new StreamWriter(stream, Encoding.UTF8))
using (var writer = new CsvWriter(sw))
{
foreach (var record in data)
{
writer.WriteRecord(record);
await writer.NextRecordAsync();
}
}
}
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