How to Upload Image to Server in C#
By FoxLearn 7/17/2024 4:22:06 AM 12.85K
How to Upload Image to Web Server in C#
Create a new Windows Forms Application project.
Drag and drop the PictureBox, Button, TextBox controls from the Visual Studio toolbox into your form designer, then design a simple UI allows you to display image to PictureBox, show image path to TextBox and upload image to server in c# as shown below.
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Right-clicking on your project, then select Manage Nuget Packages. Next, Search 'RestSharp', then download and install it.
On the server side, you need a script to handle the uploaded image data and save it to the appropriate location on the server. If you don't know how to create a web api you can view this post How to Upload files in ASP.NET Core Web API using C#.
Adding a click event handler to the Upload button allows you to upload an image to server in c#.
private async void btnUpload_Click(object sender, EventArgs e) { //c# open file dialog with image filters using (OpenFileDialog ofd = new OpenFileDialog() { Filter = "Image Files(*.jpg; *.jpeg; *.gif; *.bmp; *.png)|*.jpg; *.jpeg; *.gif; *.bmp; *.png" }) { // Get the file path from the use if (ofd.ShowDialog() == DialogResult.OK) { //c# display image in picture box pictureBox1.Image = new Bitmap(ofd.FileName); //c# show image file path txtFileName.Text = ofd.FileName; //c# upload image to web server using (var fileStream = File.Open(ofd.FileName, FileMode.Open)) { // Set the URL of the server script that handles the upload var client = new RestClient("http://localhost:11122/api/file/upload"); var request = new RestRequest(Method.POST); using (MemoryStream memoryStream = new MemoryStream()) { await fileStream.CopyToAsync(memoryStream); request.AddFile("file", memoryStream.ToArray(), ofd.FileName); request.AlwaysMultipartFormData = true; var response = await client.ExecuteAsync(request); if (response.StatusCode == System.Net.HttpStatusCode.OK) { dynamic json = JsonConvert.DeserializeObject(response.Content); string fileName = json.fileName; //Handling your code } } } } } }
Below is using HttpClient
to upload files in c# windows forms
private async void btnUpload_Click(object sender, EventArgs e) { //c# open file dialog with image filters using (OpenFileDialog ofd = new OpenFileDialog() { Filter = "Image Files(*.jpg; *.jpeg; *.gif; *.bmp; *.png)|*.jpg; *.jpeg; *.gif; *.bmp; *.png" }) { // Get the file path from the use if (ofd.ShowDialog() == DialogResult.OK) { //c# display image in picture box pictureBox1.Image = new Bitmap(ofd.FileName); //c# show image file path txtFileName.Text = ofd.FileName; //c# upload image to web server using (var client = new HttpClient()) { // Set the URL of the server script that handles the upload string url = "http://localhost:11122/api/file/upload"; using (var content = new MultipartFormDataContent()) { // Add the image file to the content string filePath = ofd.FileName; byte[] fileBytes = File.ReadAllBytes(filePath); content.Add(new ByteArrayContent(fileBytes), "file", Path.GetFileName(filePath)); // Send the POST request HttpResponseMessage response = await client.PostAsync(url, content); // Check the response status if (response.IsSuccessStatusCode) { //Image uploaded successfully dynamic json = JsonConvert.DeserializeObject(response.Content); string fileName = json.fileName; //Handling your code } else { //"Failed to upload image. } } } } } }
If you want to get the filename when the file is uploaded to the server. You need to install RestSharp.Newtonsoft.Json from Manage Nuget Packages in your Visual Studio.
Through this post, i hope so you can understand how to upload image to server c# windows application via c# web api upload file with model asp.net core.