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I have this class:
public class UploadImageData
{
public IFormFile Image { get; set; }
public string ImageUId { get; set; }
public string Label { get; set; }
public string Name { get; set; }
}
I have an Imageblock in UI (multiple images in block). Every record has an Image along with Name, Label and ImageUid.
I wanted to pass a list of custom objects (UploadImageData) to an ASP.NET Core Web API, but it is not working as expected. I am passing from fromform.
I'm not getting fileupload for image. Entire block is being passed as a multipart/form-data parameter.
How to pass List<UploadImageData> to an ASP.NET Core Web API?
I tried like this:
public async Task<IActionResult> UploadImage([FromForm] List<UploadImageData> uploadImageInput)
I have this class:
public class UploadImageData
{
public IFormFile Image { get; set; }
public string ImageUId { get; set; }
public string Label { get; set; }
public string Name { get; set; }
}
I have an Imageblock in UI (multiple images in block). Every record has an Image along with Name, Label and ImageUid.
I wanted to pass a list of custom objects (UploadImageData) to an ASP.NET Core Web API, but it is not working as expected. I am passing from fromform.
I'm not getting fileupload for image. Entire block is being passed as a multipart/form-data parameter.
How to pass List<UploadImageData> to an ASP.NET Core Web API?
I tried like this:
public async Task<IActionResult> UploadImage([FromForm] List<UploadImageData> uploadImageInput)
1 Answer
Reset to default 0Here is an test html, it works properly.
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Test Upload API</title>
</head>
<body>
<h1>Upload Multiple Images</h1>
<form id="uploadForm">
<div id="imageBlocks">
<div class="image-block">
<label>Image:</label>
<input type="file" name="image"><br>
<label>Image UID:</label>
<input type="text" name="imageUId" placeholder="Enter Image UID"><br>
<label>Label:</label>
<input type="text" name="label" placeholder="Enter Label"><br>
<label>Name:</label>
<input type="text" name="name" placeholder="Enter Name"><br>
<button type="button" onclick="removeBlock(this)">Remove</button>
<hr>
</div>
</div>
<button type="button" id="addImageBlock">Add Another Image</button><br><br>
<button type="button" onclick="uploadImages()">Upload</button>
</form>
<script>
document.getElementById('addImageBlock').addEventListener('click', () => {
const block = document.createElement('div');
block.className = 'image-block';
block.innerHTML = `
<label>Image:</label>
<input type="file" name="image"><br>
<label>Image UID:</label>
<input type="text" name="imageUId" placeholder="Enter Image UID"><br>
<label>Label:</label>
<input type="text" name="label" placeholder="Enter Label"><br>
<label>Name:</label>
<input type="text" name="name" placeholder="Enter Name"><br>
<button type="button" onclick="removeBlock(this)">Remove</button>
<hr>
`;
document.getElementById('imageBlocks').appendChild(block);
});
function removeBlock(button) {
button.parentElement.remove();
}
async function uploadImages() {
const form = document.getElementById('uploadForm');
const formData = new FormData();
const imageBlocks = document.querySelectorAll('.image-block');
imageBlocks.forEach((block, index) => {
const image = block.querySelector('input[name="image"]').files[0];
const imageUId = block.querySelector('input[name="imageUId"]').value;
const label = block.querySelector('input[name="label"]').value;
const name = block.querySelector('input[name="name"]').value;
if (image) {
formData.append(`uploadImageInput[${index}].Image`, image);
}
formData.append(`uploadImageInput[${index}].ImageUId`, imageUId);
formData.append(`uploadImageInput[${index}].Label`, label);
formData.append(`uploadImageInput[${index}].Name`, name);
});
try {
const response = await fetch('https://localhost:7247/Test/UploadImage', {
method: 'POST',
body: formData,
});
if (response.ok) {
const result = await response.json();
alert('Upload successful! Response: ' + JSON.stringify(result));
} else {
const error = await response.text();
alert('Upload failed! Error: ' + error);
}
} catch (err) {
alert('An error occurred: ' + err.message);
}
}
</script>
</body>
</html>
本文标签： How to pass list of custom object with an image to ASPNET Core Web APIStack Overflow
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UploadImageAPI? Or are you using Postman? If yes, share the screenshot how you submit the request to API. – Yong Shun Commented yesterday