Blazor [WASM]获取图像大小

@page "/image-size"

<h3>获取图像大小</h3>

<input type="file" id="imageFile" @onchange="GetImageSize" />

<p>图像宽度: @imageWidth</p>
<p>图像高度: @imageHeight</p>

@code {
    private int imageWidth;
    private int imageHeight;

    private async Task GetImageSize()
    {
        var file = await JSRuntime.InvokeAsync<object>("getImageSize", "imageFile");
        var image = new Image();
        image.src = URL.createObjectURL(file);

        image.onload = () =>
        {
            imageWidth = image.width;
            imageHeight = image.height;
            StateHasChanged();
        };
    }
}