以下代码工作，但我想知道是否正确关闭创建的MemoryStream。应该如何执行或FileStreamResult为我处理它？
public FileStreamResult DownloadBudgetedRoleOpportunities(
Guid projectGuid,IEnumerable<Guid> guidrequiredRoles)
{
var rolebroker = new ProjectRoleBudgetBroker();
var memstream = rolebroker.CreateBudgetedRoleOpportunies(
projectGuid,guidrequiredRoles);
var fsr = new FileStreamResult ( memstream,"application/csv" )
{
FileDownloadName = "RoleOpportunities.csv"
};
// memstream.Close(); throws exception
return fsr;
}
解决方法
FileStreamResult会为你做。当有疑问总是检查代码，因为代码永远不会说谎，并且由于ASP.NET MVC是开源的，它更容易查看代码。
通过Google for FileStreamResult.cs快速搜索，您可以验证在WriteFile方法中，使用using语句正确处理流。 (无双关意)
protected override void WriteFile(HttpResponseBase response) {
// grab chunks of data and write to the output stream
Stream outputStream = response.OutputStream;
using (FileStream) {
byte[] buffer = new byte[_bufferSize];
while (true) {
int bytesRead = FileStream.Read(buffer,_bufferSize);
if (bytesRead == 0) {
// no more data
break;
}
outputStream.Write(buffer,bytesRead);
}
}
}
