Added text param file type filter for <input accept="">

BlazorInputFile/InputFile.razor

@@ -1,13 +1,14 @@
 @implements IDisposable
 @inject IJSRuntime JSRuntime
 
-<input type="file" @ref="inputFileElement" @attributes="UnmatchedParameters" />
+<input type="file" @ref="inputFileElement" @attributes="UnmatchedParameters" accept="@FileFormatFilter" />
 
 @code {
     [Parameter(CaptureUnmatchedValues = true)] public Dictionary<string, object> UnmatchedParameters { get; set; }
     [Parameter] public EventCallback<IFileListEntry[]> OnChange { get; set; }
     [Parameter] public int MaxMessageSize { get; set; } = 20 * 1024; // TODO: Use SignalR default
     [Parameter] public int MaxBufferSize { get; set; } = 1024 * 1024;
+    [Parameter] public string FileFormatFilter { get; set; }
 
     ElementReference inputFileElement;
     IDisposable thisReference;

samples/Sample.Core/Pages/ImageFile.razor

@@ -4,7 +4,7 @@
 
 <p>A single file input that reads the input as an image in a chosen format with specified maximum dimensions.</p>
 
-<InputFile OnChange="HandleSelection" />
+<InputFile OnChange="HandleSelection" FileFormatFilter="image/*"  />
 
 <p>@status</p>