上一篇文章我們討論了 Azure Storage Blob
建立檔案夾和檔案 這次我們來記錄一下如何刪除檔案，還有如何判斷 檔案是否存在
物換星移，似乎微軟要換成 v12 版本 了， 請參考新的文章
刪除檔案 - 刪除 TEST2/TEST21/sampleText8.json
<![CDATA[
var connsctionString = "your_connection_string";
var cloudStorage = Microsoft.WindowsAzure.Storage.CloudStorageAccount.Parse(connsctionString);
var cloudBlobClient = cloudStorage.CreateCloudBlobClient();
var cloudBlobContainer = cloudBlobClient.GetContainerReference("donmablogsample");
var resultCreateContainer = cloudBlobContainer.CreateIfNotExistsAsync().Result;
Console.WriteLine("donmablogsample create already.");
//取得 TEST2/TEST21/ 目錄
Microsoft.WindowsAzure.Storage.Blob.CloudBlobDirectory cloudBlobDirectory =
cloudBlobContainer.GetDirectoryReference("TEST2/TEST21/");
Console.WriteLine("Delete File : TEST2/TEST21/sampleText8.json");
// 如果存在就刪除，如果只是單純使用 DeleteAsync 如果不存在 會　Exception
// 如果檔案存在被刪除， result 才會為 true , 如果檔案不存在 則 result 為 false
var result = cloudBlobDirectory.GetBlockBlobReference("sampleText8.json").DeleteIfExistsAsync().GetAwaiter().GetResult();
Console.WriteLine(result);
]]>
判斷檔案是否存在 - TEST2/TEST21/sampleText1.json 存在 , TEST2/TEST21/FileNotExisted.json 不存在
<![CDATA[
var connsctionString = "your_connection_string";
var cloudStorage = Microsoft.WindowsAzure.Storage.CloudStorageAccount.Parse(connsctionString);
var cloudBlobClient = cloudStorage.CreateCloudBlobClient();
var cloudBlobContainer = cloudBlobClient.GetContainerReference("donmablogsample");
var resultCreateContainer = cloudBlobContainer.CreateIfNotExistsAsync().Result;
Console.WriteLine("donmablogsample create already.");
Microsoft.WindowsAzure.Storage.Blob.CloudBlobDirectory cloudBlobDirectory =
cloudBlobContainer.GetDirectoryReference("TEST2/TEST21/");
//Existed : true
Console.WriteLine("TEST2/TEST21/sampleText1.json is Existed =>" + cloudBlobDirectory.GetBlockBlobReference("sampleText1.json").ExistsAsync().Result);
//Existed : false
Console.WriteLine("TEST2/TEST21/FileNotExisted.json is Existed =>" + cloudBlobDirectory.GetBlockBlobReference("FileNotExisted.json").ExistsAsync().Result);
]]>
如果你覺得我寫得不好或是太簡單，請看下面的原文吧
reference:
https://docs.microsoft.com/en-us/azure/storage/blobs/storage-blobs-overview
https://docs.microsoft.com/en-us/dotnet/api/microsoft.windowsazure.storage.blob.cloudblobcontainer.existsasync?view=azure-dotnet
https://docs.microsoft.com/en-us/dotnet/api/microsoft.windowsazure.storage.blob.cloudblobcontainer.deleteifexists?view=azure-dotnet
