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+# How to Upload and Download Files in the ABP Framework using Angular
+In this article, I will describe how to upload and download files in the ABP framework. While I will use Angular as the UI template option, most of the code is compatible with all template types. In the article I just gather the some information in one write. Nothing is new. I searched How manage files in Abp in Search engine and I didn't find. So I decided write a simple article. 
+
+### Creating App Service.
+
+An empty AppService that uses IRemoteStreamContent was created. What is the content of an IRemoteStream? Documentation from ABP entitled: `ABP Framework provides a special type, IRemoteStreamContent to be used to get or return streams in the application services.`  
+
+```csharp
+public class StorageAppService: AbpFileUploadDownloadDemoAppService // <- a inherited from ApplicationService. `ProjectName`+'AppService'.
+{
+    public Guid UploadFile(IRemoteStreamContent file)
+    {
+        Stream fs = file.GetStream();
+        
+        //save your file with guid or implement your logic
+        var id = Guid.NewGuid();
+        var filePath = "Insert your file path here/" + id.ToString();
+        using var stream = new FileStream(filePath, FileMode.Create);   
+        fs.CopyTo(stream);
+        return id;
+    }
+      public IRemoteStreamContent DownloadFile(Guid FileName)
+    {
+        //find your file with guid or implement your logic 
+        var filePath = "Insert your file path here" ;
+        var fs = new FileStream(filePath, FileMode.Open, FileAccess.Read);
+        return new RemoteStreamContent(fs);
+    }
+}
+```
+
+When you want to upload a file, app service param must be IRemoteStreamContent or RemoteStreamContent. You be able to access a file data with getStream method in AppService. After that, There s no ABP spesific code. is a  c# spesific class. You can save a file system, move somewhere or serilize as base64 etc. 
+
+when you want to download file, A method should return IRemoteStreamContent or RemoteStreamContent. 
+RemoteStreamContent get a required parameter. The parameter type must be Stream. (FileStream,MemoryStream, Custom etc...)
+
+More information please read the topic in the Documentation:  https://docs.abp.io/en/abp/latest/Application-Services#working-with-streams
+
+### Creating Angular proxy services
+
+ABP create proxy files `abp generate-proxy -t ng` command. let's check the code.
+
+```javascript
+
+ uploadFileByFile = (file: FormData, config?: Partial<Rest.Config>) =>
+    this.restService.request<any, string>({
+      method: 'POST',
+      responseType: 'text',
+      url: '/api/app/storage/upload-file',
+      body: file,
+    },
+    { apiName: this.apiName,...config });
+
+```
+Service name a little bit wierd but let's focus the first parameter. the type of The file param  is `FormData`. FormData is a native object in JavaSript. See the detail.  https://developer.mozilla.org/en-US/docs/Web/API/FormData . 
+
+How to use `uploadFileByFile` function.
+
+```javascript
+const myFormData = new FormData();
+myFormData.append('file', inputFile); // file must match variable name in AppService
+storageService.uploadFileByFile(file).subscribe()
+```
+ inputFile type is File. Most case it come from `<input type="File">` File is belong to Javacsript Web Api. see the detail https://developer.mozilla.org/en-US/docs/Web/API/File
+
+
+Let's contine with "download"
+
+```javascript
+
+  downloadFileByFileName = (FileName: string, config?: Partial<Rest.Config>) =>
+    this.restService.request<any, Blob>({
+      method: 'POST',
+      responseType: 'blob',
+      url: '/api/app/storage/download-file',
+      params: { fileName: FileName },
+    },
+    { apiName: this.apiName,...config });
+
+```
+
+The return type of function is Blob. the Blob is another javacript object. See the detail: https://developer.mozilla.org/en-US/docs/Web/API/Blob.
+
+Now our code is not ABP Spesific. It is just javascript code. If you don't want to save blob, here I asked my best Ai friend ChatGPT. `Hello, chat! The programming lang is javascript. My variable type is Blob. How do I save file to client's machine?`   
+
+Our the gifted friend gives us the code
+```javascript
+function saveBlobToFile(blob, fileName) {
+    // Create a blob URL
+    const blobURL = window.URL.createObjectURL(blob);
+
+    // Create an anchor element for the download
+    const a = document.createElement("a");
+    a.href = blobURL;
+    a.download = fileName || 'download.dat'; // Provide a default file name if none is provided
+
+    // Append the anchor to the document
+    document.body.appendChild(a);
+
+    // Simulate a click on the anchor to initiate the download
+    a.click();
+
+    // Clean up: remove the anchor and revoke the blob URL
+    document.body.removeChild(a);
+    window.URL.revokeObjectURL(blobURL);
+}
+
+// Usage example
+const blob = new Blob(['Hello, World!'], { type: 'text/plain' });
+saveBlobToFile(blob, 'hello.txt');
+``` 
+