只能输入数字的输入框，为避免命名冲突，先命名为MyInputNumber。

MyInputNumber.razor

@inherits InputBase<TValue>
@typeparam TValue
<div class="d-flex"><label class="control-label w-auto mt-2"><b>@Lable</b></label><div style="width:@InputWidth"><input type="number" @bind-value="CurrentValue" class="form-control" disabled="@Disabled" @ref="Element" /><span class="w-100"><ValidationMessage For="ValueExpression" /></span></div>
</div>

MyInputNumber.razor.cs

    public partial class MyInputNumber<[DynamicallyAccessedMembers(DynamicallyAccessedMemberTypes.All)] TValue> : InputBase<TValue>{[Parameter]public required string Lable { get; set; }[Parameter]public string InputWidth { get; set; } = "300";[Parameter]public bool Disabled { get; set; }protected override void OnParametersSet(){base.OnParametersSet();Lable += "：";InputWidth += "px;";}//以下是复制于InputNumber 的源码，除了渲染部分注释掉外未作改动。private static readonly string _stepAttributeValue = GetStepAttributeValue();private static string GetStepAttributeValue(){// Unwrap Nullable<T>, because InputBase already deals with the Nullable aspect// of it for us. We will only get asked to parse the T for nonempty inputs.var targetType = Nullable.GetUnderlyingType(typeof(TValue)) ?? typeof(TValue);if (targetType == typeof(int) ||targetType == typeof(long) ||targetType == typeof(short) ||targetType == typeof(float) ||targetType == typeof(double) ||targetType == typeof(decimal)){return "any";}else{throw new InvalidOperationException($"The type '{targetType}' is not a supported numeric type.");}}/// <summary>/// Gets or sets the error message used when displaying an a parsing error./// </summary>[Parameter] public string ParsingErrorMessage { get; set; } = "The {0} field must be a number.";/// <summary>/// Gets or sets the associated <see cref="ElementReference"/>./// <para>/// May be <see langword="null"/> if accessed before the component is rendered./// </para>/// </summary>[DisallowNull] public ElementReference? Element { get; protected set; }//这里是生成渲染树，我们用MyInputNumber.razor代替了。/// <inheritdoc />//protected override void BuildRenderTree(RenderTreeBuilder builder)//{//    builder.OpenElement(0, "input");//    builder.AddAttribute(1, "step", _stepAttributeValue);//    builder.AddMultipleAttributes(2, AdditionalAttributes);//    builder.AddAttribute(3, "type", "number");//    builder.AddAttributeIfNotNullOrEmpty(4, "name", NameAttributeValue);//    builder.AddAttributeIfNotNullOrEmpty(5, "class", CssClass);//    builder.AddAttribute(6, "value", CurrentValueAsString);//    builder.AddAttribute(7, "onchange", EventCallback.Factory.CreateBinder<string?>(this, __value => CurrentValueAsString = __value, CurrentValueAsString));//    builder.SetUpdatesAttributeName("value");//    builder.AddElementReferenceCapture(8, __inputReference => Element = __inputReference);//    builder.CloseElement();//}/// <inheritdoc />protected override bool TryParseValueFromString(string? value, [MaybeNullWhen(false)] out TValue result, [NotNullWhen(false)] out string? validationErrorMessage){if (BindConverter.TryConvertTo<TValue>(value, CultureInfo.InvariantCulture, out result)){validationErrorMessage = null;return true;}else{validationErrorMessage = string.Format(CultureInfo.InvariantCulture, ParsingErrorMessage, DisplayName ?? FieldIdentifier.FieldName);return false;}}/// <summary>/// Formats the value as a string. Derived classes can override this to determine the formatting used for <c>CurrentValueAsString</c>./// </summary>/// <param name="value">The value to format.</param>/// <returns>A string representation of the value.</returns>protected override string? FormatValueAsString(TValue? value){// Avoiding a cast to IFormattable to avoid boxing.switch (value){case null:return null;case int @int:return BindConverter.FormatValue(@int, CultureInfo.InvariantCulture);case long @long:return BindConverter.FormatValue(@long, CultureInfo.InvariantCulture);case short @short:return BindConverter.FormatValue(@short, CultureInfo.InvariantCulture);case float @float:return BindConverter.FormatValue(@float, CultureInfo.InvariantCulture);case double @double:return BindConverter.FormatValue(@double, CultureInfo.InvariantCulture);case decimal @decimal:return BindConverter.FormatValue(@decimal, CultureInfo.InvariantCulture);default:throw new InvalidOperationException($"Unsupported type {value.GetType()}");}}}

使用：

<EditForm Model="MyNumber1">
<p><MyInputNumber Lable="数字测试" @bind-Value="MyNumber1.MyNumber1" InputWidth="300" ParsingErrorMessage="这里只能输入数字！" /></p>
</EditForm>
@code{private MyNumber MyNumber1 = new();internal class MyNumber{internal int MyNumber1 { get; set; }}
}//其中加不加 TValue="int"好像都行

效果：