Question

如何将csv日志存储到Azure AppendBlob而不影响任何性能？

将csv写入内存流的代码：

public static byte[] WriteCsvWithHeaderToMemory<T>(IEnumerable<T> records) where T : class
{
    var outputFileDescription = new CsvFileDescription
    {
        SeparatorChar = ',',
        EnforceCsvColumnAttribute = true,
    };

    using (var memoryStream = new MemoryStream())
    {
        using (var streamWriter = new StreamWriter(memoryStream))
        {
            var context = new CsvContext();
            context.Write(records, streamWriter, outputFileDescription);
        }
        return memoryStream.ToArray();                
    }
}

由于

Answer 1

public async Task WriteToAudit<T>(T logData)
{
    var list = new List<T> {logData};

    var appendBlob = GetAppendBlobReference();
    appendBlob.FetchAttributes();

    var auditDataBytes = WriteCsvWithHeaderToMemory(list,appendBlob.Properties.Length);

    using (var stream = new MemoryStream(auditDataBytes))
    {
        await appendBlob.AppendBlockAsync(stream).ConfigureAwait(false);
    }
}

public static byte[] WriteCsvWithHeaderToMemory<T>(IEnumerable<T> records, long blobSize) where T : class
{
    var outputFileDescription = new CsvFileDescription
    {
        SeparatorChar = ',',
        EnforceCsvColumnAttribute = true,
        FirstLineHasColumnNames = blobSize <= 0 
    };

    using (var memoryStream = new MemoryStream())
    {
        using (var streamWriter = new StreamWriter(memoryStream))
        {
            var context = new CsvContext();
            context.Write(records, streamWriter, outputFileDescription);
        }
        return memoryStream.ToArray();                
    }
}

如何在Azure AppendBlob

1 个答案: