[英]ASP.NET download csv file as zip?
我一直在閱讀:
而不是像 csv 中描述的那樣只能選擇下載:
//Download the CSV file.
Response.Clear();
Response.Buffer = true;
Response.AddHeader("content-disposition", "attachment;filename=SqlExport.csv");
Response.Charset = "";
Response.ContentType = "application/text";
Response.Output.Write(csv);
Response.Flush();
Response.End();
有沒有辦法使用本機 asp.net 到第一個 zip csv output 來自 Response.Output.Write(csv) 中的 csv 變量; 以便用戶下載 SqlExport.zip 而不是 SqlExport.csv?
大致基於此,您可以創建一個 zip 文件,同時將其推流到客戶端;
Response.ContentType = "application/octet-stream";
Response.Headers.Add("Content-Disposition", "attachment; filename=\"SqlExport.zip\"");
using var archive = new ZipArchive(Response.Body, ZipArchiveMode.Create);
var entry = archive.CreateEntry("SqlExport.csv");
using var entryStream = entry.Open();
entryStream.Write(csv); // write the actual content here
entryStream.Flush();
雖然不是附加到單個csv
字符串,您應該考慮使用StreamWriter
將每個文本片段直接寫入響應 stream。從鏈接的 csv 示例中替換;
using var sw = new StreamWriter(entryStream);
// TODO write header
foreach (DataRow row in dt.Rows)
{
foreach (DataColumn column in dt.Columns)
{
//Add the Data rows.
await sw.WriteAsync(row[column.ColumnName].ToString().Replace(",", ";") + ',');
}
//Add new line.
await sw.WriteLineAsync();
}
盡管這是 csv 文件的一個糟糕示例。 而不是替換';'
字符,字符串應該被引用並轉義所有引號。
然而Response.Body
僅在 .net 5 / core 中可用。 要在 .net 4.8 或更早版本中直接寫入 http 響應,您必須編寫自己的HttpContent
。 將所有東西放在一起,包括更好的 csv 格式化程序;
public class ZipContent : HttpContent
{
private DataTable dt;
private string name;
public ZipContent(DataTable dt, string name = null)
{
this.dt = dt;
this.name = name ?? dt.TableName;
Headers.ContentType = MediaTypeHeaderValue.Parse("application/octet-stream");
Headers.ContentDisposition = new ContentDispositionHeaderValue("attachment")
{
FileName = $"{name}.zip"
};
}
private string formatCsvValue(string value)
{
if (value == null)
return "";
if (value.Contains('"') || value.Contains(',') || value.Contains('\r') || value.Contains('\n'))
return $"\"{value.Replace("\"", "\"\"")}\"";
return value;
}
private IEnumerable<DataColumn> Columns()
{
// Why is this not already an IEnumerable<DataColumn>?
foreach (DataColumn col in dt.Columns)
yield return col;
}
protected override async Task SerializeToStreamAsync(Stream stream, TransportContext context)
{
using var archive = new ZipArchive(stream, ZipArchiveMode.Create);
var entry = archive.CreateEntry($"{name}.csv");
using var entryStream = entry.Open();
using var sw = new StreamWriter(entryStream);
await sw.WriteLineAsync(
string.Join(",",
Columns()
.Select(c => formatCsvValue(c.ColumnName))
));
foreach (DataRow row in dt.Rows)
{
await sw.WriteLineAsync(
string.Join(",",
row.ItemArray
.Select(o => formatCsvValue(o?.ToString()))
));
}
}
protected override bool TryComputeLength(out long length)
{
length = 0;
return false;
}
}
你可以使用public System.IO.Compression.ZipArchiveEntry CreateEntry (string entryName);
創建一個 ZipEntry 並將其添加到存檔
聲明:本站的技術帖子網頁,遵循CC BY-SA 4.0協議,如果您需要轉載,請注明本站網址或者原文地址。任何問題請咨詢:yoyou2525@163.com.