[.NET]阿里云OSS上传下载与生成图片链接

• 本文Demo下载

项目中需要添加以下依赖项，在控制台中执行安装依赖项：

Install-Package Aliyun.OSS.SDK --适用于.NET版本
Install-Package Aliyun.OSS.SDK.NetCore --适用.NET Core版本

以下是封装的上传下载以及生成图片链接的方法：

/// <summary>
/// 上传文件
/// </summary>
/// <param name="accessKeyId">开发者秘钥对，通过阿里云控制台的秘钥管理页面创建与管理</param>
/// <param name="accessKeySecret">开发者秘钥对，通过阿里云控制台的秘钥管理页面创建与管理</param>
/// <param name="endpoint">Endpoint，创建Bucket时对应的Endpoint</param>
/// <param name="bucketName">Bucket名称，创建Bucket时对应的Bucket名称</param>
/// <param name="key">文件标识</param>
/// <param name="file">需要上传文件的文件路径</param>
public static void PutObject(string accessKeyId, string accessKeySecret, string endpoint, string bucketName, string key, string file)
{
    var client = new OssClient(endpoint, accessKeyId, accessKeySecret);
    try
    {
        client.PutObject(bucketName, key, file);
    }
    catch (OssException ex)
    {
        LogHelper.LogException<OssException>(
            $"Msg:{ex.Message};Code:{ex.ErrorCode};RequestID:{ex.RequestId};HostID:{ex.HostId}");
    }
}

/// <summary>
/// 下载文件
/// </summary>
/// <param name="accessKeyId">开发者秘钥对，通过阿里云控制台的秘钥管理页面创建与管理</param>
/// <param name="accessKeySecret">开发者秘钥对，通过阿里云控制台的秘钥管理页面创建与管理</param>
/// <param name="endpoint">Endpoint，创建Bucket时对应的Endpoint</param>
/// <param name="bucketName">Bucket名称，创建Bucket时对应的Bucket名称</param>
/// <param name="key">文件标识</param>
/// <param name="file">下载存放的文件路径</param>
public static void GetObject(string accessKeyId, string accessKeySecret, string endpoint, string bucketName, string key, string file)
{
    var client = new OssClient(endpoint, accessKeyId, accessKeySecret);
    try
    {
        var result = client.GetObject(bucketName, key);
        using (var requestStream = result.Content)
        {
            using (var fs = File.Open(file, FileMode.OpenOrCreate))
            {
                int length = 4 * 1024;
                var buf = new byte[length];
                do
                {
                    length = requestStream.Read(buf, 0, length);
                    fs.Write(buf, 0, length);
                } while (length != 0);
            }
        }
    }
    catch (OssException ex)
    {
        LogHelper.LogException<OssException>(
            $"Msg:{ex.Message};Code:{ex.ErrorCode};RequestID:{ex.RequestId};HostID:{ex.HostId}");
    }
}

/// <summary>
/// 获取图片地址
/// </summary>
/// <param name="accessKeyId">开发者秘钥对，通过阿里云控制台的秘钥管理页面创建与管理</param>
/// <param name="accessKeySecret">开发者秘钥对，通过阿里云控制台的秘钥管理页面创建与管理</param>
/// <param name="endpoint">Endpoint，创建Bucket时对应的Endpoint</param>
/// <param name="bucketName">Bucket名称，创建Bucket时对应的Bucket名称</param>
/// <param name="key">文件标识</param>
/// <param name="width">设置图片的宽度</param>
/// <param name="height">设置图片的高度</param>
/// <returns></returns>
public static string GetIamgeUri(string accessKeyId, string accessKeySecret, string endpoint, string bucketName, string key, float width = 100, float height = 100)
{
    var client = new OssClient(endpoint, accessKeyId, accessKeySecret);
    try
    {
        var process = $"image/resize,m_fixed,w_{width},h_{height}";
        var req = new GeneratePresignedUriRequest(bucketName, key, SignHttpMethod.Get)
        {
            Expiration = DateTime.Now.AddHours(1),
            Process = process
        };
        var uri = client.GeneratePresignedUri(req);
        return uri.ToString();
    }
    catch (OssException ex)
    {
        LogHelper.LogException<OssException>(
            $"Msg:{ex.Message};Code:{ex.ErrorCode};RequestID:{ex.RequestId};HostID:{ex.HostId}");
    }
}

调用方法：

var accessKeyId = "";
var accessKeySecret = "";
var endpoint = "oss-cn-shenzhen.aliyuncs.com";
var bucketName = "service-img";

// 上传文件
OssApi.PutObject(accessKeyId, accessKeySecret, endpoint, bucketName, "2019012215062801", "C:/Users/as/Desktop/2019012215062801.png");

// 下载文件
OssApi.GetObject(accessKeyId, accessKeySecret, endpoint, bucketName, "2019012215062801", "C:/Users/as/Desktop/down.png");

// 获取图片链接地址
OssApi.GetIamgeUri(accessKeyId, accessKeySecret, endpoint, bucketName, "2019012215062801", 100, 100);

原文地址：https://www.jianshu.com/p/dbe6da54ade4