[英]ASP.NET download csv file as zip?
I've been reading through:我一直在阅读:
https://www.aspsnippets.com/Articles/Export-data-from-SQL-Server-to-CSV-file-in-ASPNet-using-C-and-VBNet.aspx https://www.aspsnippets.com/Articles/Export-data-from-SQL-Server-to-CSV-file-in-ASPNet-using-C-and-VBNet.aspx
Rather than only have the option to download as csv as described there in:而不是像 csv 中描述的那样只能选择下载:
//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();
is there a way using native asp.net to first zip the csv output from the csv variable in Response.Output.Write(csv);有没有办法使用本机 asp.net 到第一个 zip csv output 来自 Response.Output.Write(csv) 中的 csv 变量; so that the user downloads SqlExport.zip rather than SqlExport.csv?
以便用户下载 SqlExport.zip 而不是 SqlExport.csv?
Roughly based on this , you can create a zip file while streaming it to the client;大致基于此,您可以创建一个 zip 文件,同时将其推流到客户端;
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();
Though rather than appending to a single csv
string, you should probably consider using a StreamWriter
to write each snippet of text directly into the response stream. Substituting from your linked csv example;虽然不是附加到单个
csv
字符串,您应该考虑使用StreamWriter
将每个文本片段直接写入响应 stream。从链接的 csv 示例中替换;
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();
}
Though that is a terrible example of a csv file.尽管这是 csv 文件的一个糟糕示例。 Rather than substituting
';'
而不是替换
';'
characters, the string should be quoted & all quotes escaped.字符,字符串应该被引用并转义所有引号。
However Response.Body
is only available in .net 5 / core.然而
Response.Body
仅在 .net 5 / core 中可用。 To write directly to a http response in .net 4.8 or earlier, you'll have to write your own HttpContent
.要在 .net 4.8 或更早版本中直接写入 http 响应,您必须编写自己的
HttpContent
。 Putting everything together, including a better csv formatter;将所有东西放在一起,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;
}
}
Have a look at the ZipArchive Class看看ZipArchive Class
you can use public System.IO.Compression.ZipArchiveEntry CreateEntry (string entryName);
你可以使用
public System.IO.Compression.ZipArchiveEntry CreateEntry (string entryName);
to create an ZipEntry nd add it to an archive创建一个 ZipEntry 并将其添加到存档
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