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.NET 使用 Azure Blob 存储图片或文件
使用的是VS2017
一、先使用 NuGet 获取这两个包。 执行以下步骤:
在“解决方案资源管理器”中，右键单击你的项目并选择“管理 NuGet 包”。
1.在线搜索“WindowsAzure.Storage”，然后单击“安装” 以安装存储客户端库和依赖项。
2.在线搜索“WindowsAzure.ConfigurationManager”，然后单击“安装”以安装 Azure Configuration Manager。
会生成5个dll,如下图：
封装代码如下：
需要先引用
using Microsoft.Azure;using Microsoft.WindowsAzure.Storage;using Microsoft.WindowsAzure.Storage.Blob;
1).AzureBlob.cs
public class AzureBlob{ #region 私有变量 //类的成员，用于创建Blob服务客户端 CloudBlobClient blobClient; //容器和Blob其实就相当于文件夹、文件名 /// <summary> /// 连接字符串 /// </summary> private string storageConnectionString = CloudConfigurationManager.GetSetting("StorageConnectionString"); #endregion #region 构造函数创建Blob服务客户端 public AzureBlob() { //解析配置中的连接字符串 CloudStorageAccount storageAccount = CloudStorageAccount.Parse(storageConnectionString); //创建Blob服务客户端 blobClient = storageAccount.CreateCloudBlobClient(); } #endregion #region 获取块Blob引用 /// <summary> /// 获取块Blob引用 /// </summary> /// <param name="mycontainer">容器名</param> /// <param name="fileName">文件名</param> /// <returns></returns> public CloudBlockBlob GetContainer(string mycontainer, string fileName) { //获取容器的引用 CloudBlobContainer container = blobClient.GetContainerReference(mycontainer); //获取块 Blob 引用 CloudBlockBlob blob = container.GetBlockBlobReference(fileName); return blob; } #endregion #region 二进制形式上传文件 /// <summary> /// 二进制形式上传文件 /// </summary> /// <param name="fileName">文件名</param> /// <param name="mycontainer">容器名</param> /// <param name="bytes">二进制形式的文件</param> /// <returns>异步信息</returns> public Task UploadToBlob(string fileName,string mycontainer,byte[] bytes) { //获取容器的引用 CloudBlobContainer container = blobClient.GetContainerReference(mycontainer); //创建一个容器（如果该容器不存在） container.CreateIfNotExists(); //设置该容器为公共容器，也就是说网络上能访问容器中的文件，但不能修改、删除 container.SetPermissions(new BlobContainerPermissions { PublicAccess = BlobContainerPublicAccessType.Blob }); //将Blob（文件）上载到容器中，如果已存在同名Blob，则覆盖它 CloudBlockBlob blockBlob = container.GetBlockBlobReference(fileName);//获取块 Blob 引用 Task result = blockBlob.UploadFromByteArrayAsync(bytes, 0, bytes.Length);//将二进制文件上传 return result; } #endregion #region 文件路径上传 /// <summary> /// 文件路径上传 /// </summary> /// <param name="fileName">文件名</param> /// <param name="mycontainer">容器名</param> /// <param name="filePath">文件路径</param> /// <returns></returns> public string UploadToBlob(string fileName, string mycontainer,string filePath) { ////获取容器的引用 CloudBlobContainer container = blobClient.GetContainerReference(mycontainer); //创建一个容器（如果该容器不存在） container.CreateIfNotExists(); //设置该容器为公共容器，也就是说网络上能访问容器中的文件，但不能修改、删除 container.SetPermissions(new BlobContainerPermissions { PublicAccess = BlobContainerPublicAccessType.Blob }); //将Blob（文件）上载到容器中，如果已存在同名Blob，则覆盖它 CloudBlockBlob blockBlob = container.GetBlockBlobReference(fileName);//获取块 Blob 引用 //文件路径 using (var fileStream = System.IO.File.OpenRead(filePath)) { blockBlob.UploadFromStream(fileStream); } return blockBlob.Uri.ToString(); } #endregion #region 根据文件名和容器名取到Blob地址 /// <summary> /// 根据文件名和容器名取到Blob地址 /// </summary> /// <param name="fileName">文件名</param> /// <param name="mycontainer">容器名</param> /// <returns></returns> public string GetBlobURI(string fileName, string mycontainer) { CloudBlockBlob blob = GetContainer(mycontainer, fileName); return blob.Uri.ToString(); } #endregion #region 下载Blob /// <summary> /// 下载Blob /// </summary> /// <param name="fileName">文件名</param> /// <param name="mycontainer">容器名</param> /// <param name="fliePath">文件路径</param> public void DownloadToFile(string fileName, string mycontainer, string fliePath) { CloudBlockBlob blob = GetContainer(mycontainer, fileName); using (var fileStream = File.OpenWrite(fliePath)) { blob.DownloadToStream(fileStream); //将blob保存在指定路径 } } #endregion #region 下载Blob /// <summary> /// 下载Blob /// </summary> /// <param name="fileName">文件名</param> /// <param name="mycontainer">容器名</param> /// <param name="fliePath">文件路径</param> public string DownloadToStream(string fileName, string mycontainer) { CloudBlockBlob blob = GetContainer(mycontainer, fileName); string text; using (var memoryStream = new MemoryStream()) { blob.DownloadToStream(memoryStream); text = System.Text.Encoding.UTF8.GetString(memoryStream.ToArray()); } return text; } #endregion #region 下载Blob /// <summary> /// 下载Blob /// </summary> /// <param name="fileName">文件名</param> /// <param name="mycontainer">容器名</param> /// <param name="fliePath">文件路径</param> public void DownloadToFileStream(string fileName, string mycontainer, string fliePath) { CloudBlockBlob blob = GetContainer(mycontainer, fileName); using (var fileStream = new FileStream(fliePath, FileMode.OpenOrCreate)) { blob.DownloadToStream(fileStream); //将blob保存在指定路径 }; } #endregion #region 删除Blob /// <summary> /// 删除Blob /// </summary> /// <param name="fileName">文件名</param> /// <param name="mycontainer">容器名</param> public void DeleteBlob(string fileName, string mycontainer) { CloudBlockBlob blob = GetContainer(mycontainer, fileName); blob.Delete(); } #endregion}
2).单元测试类：class AzureBlob_Test.cs
[TestClass]public class AzureBlob_Test{ AzureBlob azureBlob = new AzureBlob(); private string containername = ConfigurationManager.AppSettings["userimg"].ToString(); [TestMethod] public void TestUploadToBlob() { //string imgCode = "" //Byte[] buffer = Convert.FromBase64String(imgCode.Replace(" ", "+")); //var result = azureBlob.UploadToBlob("test", containername, buffer); string str = "userImg/430223198701159158_601421613.png"; var str1 = str.Contains("/"); Assert.IsTrue(str1); } [TestMethod] //OK public void TestGetBlobURI() { var result = azureBlob.GetBlobURI("test", containername); Assert.IsNotNull(result);//https://08afc0c4store.blob.core.chinacloudapi.cn/images/test } [TestMethod] //OK public void TestUploadToBlob2() { var fileName = "1_2.jpg"; var filePath = @"F:\img\"+ fileName; azureBlob.UploadToBlob(fileName, containername, filePath); } [TestMethod] public void TestDownloadToFile() { var fileName = "2017.jpg"; var filePath = @"images\2017.jpg"; //filePath = azureBlob.GetBlobURI(fileName, containername); azureBlob.DownloadToFile(fileName, containername, filePath); } [TestMethod] public void TestDownloadToStream() { var fileName = "2017.jpg";; //filePath = azureBlob.GetBlobURI(fileName, containername); azureBlob.DownloadToStream(fileName, containername); } [TestMethod] public void TestDownloadToFileStream() { var fileName = "2017.jpg"; ; var filePath = @"test\2017.jpg"; //filePath = azureBlob.GetBlobURI(fileName, containername); azureBlob.DownloadToFileStream(fileName, containername, filePath); } [TestMethod] //OK public void TestDeleteBlob() { var fileName = "2017.jpg"; azureBlob.DeleteBlob(fileName, containername); }}
3).在web.config 下的<configuration>-><appSettings>下添加：
<!--存储图片连接字符串 --><add key="StorageConnectionString" value="DefaultEndpointsProtocol=https;AccountName=test;AccountKey=1234;EndpointSuffix=core.chinacloudapi.cn" /><!--容器名,必须是小写--><add key="test" value="test" />
4).通过Azure Storage Explorer 6查看上传的图片，下载地址为：http://azurestorageexplorer.codeplex.com/releases/view/125870 下的 AzureStorageExplorer6Preview3.zip
参考：http://www.jianshu.com/p/bf265c6ceedd
https://docs.azure.cn/zh-cn/storage/storage-dotnet-how-to-use-blobs
相关开发资源 https://docs.azure.cn/zh-cn/storage/
.NET 使用 Azure Blob 存储图片或文件
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