refactor: 更新 ValueString 格式化方法

Author: ArgoZhang

src/BootstrapBlazor/Components/Upload/InputUpload.razor.cs

@@ -102,14 +102,6 @@ protected override void OnParametersSet()
         DeleteButtonIcon ??= IconTheme.GetIconByKey(ComponentIcons.InputUploadDeleteButtonIcon);
     }
 
-    /// <summary>
-    /// <inheritdoc/>
-    /// </summary>
-    protected override string? FormatValueAsString(TValue? value)
-    {
-        return CurrentValue?.ToString();
-    }
-
     private async Task OnDeleteFile()
     {
         foreach (var item in UploadFiles)

src/BootstrapBlazor/Components/Upload/UploadBase.cs

@@ -94,6 +94,33 @@ public abstract class UploadBase<TValue> : ValidateBase<TValue>, IUpload
     /// </summary>
     public List<UploadFile> UploadFiles { get; } = [];
 
+    /// <summary>
+    /// <inheritdoc/>
+    /// </summary>
+    protected override string? FormatValueAsString(TValue? value)
+    {
+        if (value is null)
+        {
+            return null;
+        }
+        else if (value is IEnumerable<IBrowserFile> files)
+        {
+            return string.Join(";", files.Select(i => i.Name));
+        }
+        else if (value is IBrowserFile file)
+        {
+            return file.Name;
+        }
+        else if (value is IEnumerable<string> strings)
+        {
+            return string.Join(";", strings);
+        }
+        else
+        {
+            return base.FormatValueAsString(value);
+        }
+    }
+
     /// <summary>
     /// <inheritdoc/>
     /// </summary>