C# Blazor服务器端InputSelect用于字节数据类型，onChange事件错误_C#_Asp.net Core_Blazor_Blazor Server Side_Asp.net Core 3.1

C# Blazor服务器端InputSelect用于字节数据类型，onChange事件错误

c# asp.net-core blazor

C# Blazor服务器端InputSelect用于字节数据类型，onChange事件错误,c#,asp.net-core,blazor,blazor-server-side,asp.net-core-3.1,C#,Asp.net Core,Blazor,Blazor Server Side,Asp.net Core 3.1,我使用的是ASP.NETCore3.1，Blazor服务器端。我在 @page”/add_文件集 @注入Foo.Data.ApplicationDbContext数据库 Tên文件： Mứcưu tièn： @**@ 中国ọN Rấ丁泉ọng 全trọng Bình thường Ít quan trọng 蒙特勒ạ吴塔伊： @* 瞧ại hồ sơ *@ 卢 @代码{ 公共类AddFiletSetPageModel { 公共字符串文件名{get；set；} 公共十进制？创建者ID{get；se

我使用的是ASP.NETCore3.1，Blazor服务器端。我在

@page”/add_文件集
@注入Foo.Data.ApplicationDbContext数据库
Tên文件：
Mứcưu tièn：
@**@
中国ọN
Rấ丁泉ọng
全trọng
Bình thường
Ít quan trọng
蒙特勒ạ吴塔伊：
@*
瞧ại hồ sơ
*@
卢
@代码{
公共类AddFiletSetPageModel
{
公共字符串文件名{get；set；}
公共十进制？创建者ID{get；set；}
公共日期时间？已创建{get；set；}
公共小数？ModifierId{get；set；}
公共日期时间？已修改{get；set；}
公共字节？PriorityLevel{get；set；}
公共字节？状态码{get；set；}
}
私有AddFiletSetPageModel=新的AddFiletSetPageModel（）；
私人无效手册提交（）
{
FileSet fileItem=新文件集
{
FileName=model.FileName，
CreatorId=model.CreatorId，
Created=DateTime。现在，
PriorityLevel=model.PriorityLevel，
StatusCode=model.StatusCode
};
Db.FileSet.Add（fileItem）；
Db.SaveChanges（）；
}
}

关注这些代码行

<InputSelect id="PriorityLevel" @bind-Value="model.PriorityLevel" class="form-control">
    <option>Chọn...</option>
    <option value=1>Rất quan trọng</option>
    <option value=2>Quan trọng</option>
    <option value=3>Bình thường</option>
    <option value=4>Ít quan trọng</option>
</InputSelect>


中国ọN
Rấ丁泉ọng
全trọng
Bình thường
Ít quan trọng

单击下拉列表时，控制台出现错误

[2019-12-27T08:58:22.819Z] Error: System.InvalidOperationException: Microsoft.AspNetCore.Components.Forms.InputSelect`1[System.Nullable`1[System.Byte]] does not support the type 'System.Nullable`1[System.Byte]'.

   at Microsoft.AspNetCore.Components.Forms.InputSelect`1.TryParseValueFromString(String value, TValue& result, String& validationErrorMessage)

   at Microsoft.AspNetCore.Components.Forms.InputBase`1.set_CurrentValueAsString(String value)

   at Microsoft.AspNetCore.Components.Forms.InputSelect`1.<BuildRenderTree>b__4_0(String __value)

   at Microsoft.AspNetCore.Components.EventCallbackFactoryBinderExtensions.<>c__DisplayClass22_0`1.<CreateBinderCore>b__0(ChangeEventArgs e)

--- End of stack trace from previous location where exception was thrown ---

   at Microsoft.AspNetCore.Components.ComponentBase.CallStateHasChangedOnAsyncCompletion(Task task)

   at Microsoft.AspNetCore.Components.RenderTree.Renderer.GetErrorHandledTask(Task taskToHandle) blazor.server.js:15:27309
    log https://localhost:44348/_framework/blazor.server.js:15
    C https://localhost:44348/_framework/blazor.server.js:8
    S https://localhost:44348/_framework/blazor.server.js:8
    invokeClientMethod https://localhost:44348/_framework/blazor.server.js:1
    invokeClientMethod https://localhost:44348/_framework/blazor.server.js:1
    processIncomingData https://localhost:44348/_framework/blazor.server.js:1
    onreceive https://localhost:44348/_framework/blazor.server.js:1
    onmessage https://localhost:44348/_framework/blazor.server.js:1
    (Async: EventHandlerNonNull)
    connect https://localhost:44348/_framework/blazor.server.js:1
    connect https://localhost:44348/_framework/blazor.server.js:1
    s https://localhost:44348/_framework/blazor.server.js:1
    s https://localhost:44348/_framework/blazor.server.js:1
    L https://localhost:44348/_framework/blazor.server.js:1
    L https://localhost:44348/_framework/blazor.server.js:1
    connect https://localhost:44348/_framework/blazor.server.js:1
    startTransport https://localhost:44348/_framework/blazor.server.js:1
    createTransport https://localhost:44348/_framework/blazor.server.js:1
    s https://localhost:44348/_framework/blazor.server.js:1
    s https://localhost:44348/_framework/blazor.server.js:1
    B https://localhost:44348/_framework/blazor.server.js:1
    B https://localhost:44348/_framework/blazor.server.js:1
    createTransport https://localhost:44348/_framework/blazor.server.js:1
    startInternal https://localhost:44348/_framework/blazor.server.js:1
    s https://localhost:44348/_framework/blazor.server.js:1
    s https://localhost:44348/_framework/blazor.server.js:1
    a https://localhost:44348/_framework/blazor.server.js:1
    (Async: promise callback)
    c https://localhost:44348/_framework/blazor.server.js:1
    B https://localhost:44348/_framework/blazor.server.js:1
    B https://localhost:44348/_framework/blazor.server.js:1
    startInternal https://localhost:44348/_framework/blazor.server.js:1
    start https://localhost:44348/_framework/blazor.server.js:1
    s https://localhost:44348/_framework/blazor.server.js:1
    s https://localhost:44348/_framework/blazor.server.js:1
    B https://localhost:44348/_framework/blazor.server.js:1
    B https://localhost:44348/_framework/blazor.server.js:1
    start https://localhost:44348/_framework/blazor.server.js:1
    startInternal https://localhost:44348/_framework/blazor.server.js:1
    s https://localhost:44348/_framework/blazor.server.js:1
    s https://localhost:44348/_framework/blazor.server.js:1
    v https://localhost:44348/_framework/blazor.server.js:1
    v https://localhost:44348/_framework/blazor.server.js:1
    startInternal https://localhost:44348/_framework/blazor.server.js:1
    startWithStateTransitions https://localhost:44348/_framework/blazor.server.js:1
    s https://localhost:44348/_framework/blazor.server.js:1
    s https://localhost:44348/_framework/blazor.server.js:1
    v https://localhost:44348/_framework/blazor.server.js:1
    v https://localhost:44348/_framework/blazor.server.js:1
    startWithStateTransitions https://localhost:44348/_framework/blazor.server.js:1
    start https://localhost:44348/_framework/blazor.server.js:1
    S https://localhost:44348/_framework/blazor.server.js:8
    s https://localhost:44348/_framework/blazor.server.js:8
    s https://localhost:44348/_framework/blazor.server.js:8
    r https://localhost:44348/_framework/blazor.server.js:8
    r https://localhost:44348/_framework/blazor.server.js:8
    S https://localhost:44348/_framework/blazor.server.js:8
    E https://localhost:44348/_framework/blazor.server.js:8
    s https://localhost:44348/_framework/blazor.server.js:8
    s https://localhost:44348/_framework/blazor.server.js:8
    r https://localhost:44348/_framework/blazor.server.js:8
    r https://localhost:44348/_framework/blazor.server.js:8
    E https://localhost:44348/_framework/blazor.server.js:8
    <anonymous> https://localhost:44348/_framework/blazor.server.js:8
    n https://localhost:44348/_framework/blazor.server.js:1
    <anonymous> https://localhost:44348/_framework/blazor.server.js:1
    <anonymous> https://localhost:44348/_framework/blazor.server.js:1

[2019-12-27T08:58:22.819Z]错误：System.InvalidOperationException:Microsoft.AspNetCore.Components.Forms.InputSelect`1[System.Nullable`1[System.Byte]]不支持类型“System.Nullable`1[System.Byte]”。
在Microsoft.AspNetCore.Components.Forms.InputSelect`1.TryParseValueFromString（字符串值、TValue和结果、字符串和验证错误消息）
在Microsoft.AspNetCore.Components.Forms.InputBase`1.set\u CurrentValueAsString（字符串值）中
在Microsoft.AspNetCore.Components.Forms.InputSelect`1.b_uuu4_0（字符串值）
在Microsoft.AspNetCore.Components.EventCallbackFactoryBinderExtensions.c__显示类22_0`1.b__0（ChangeEventArgs e）
---来自引发异常的上一个位置的堆栈结束跟踪---
位于Microsoft.AspNetCore.Components.ComponentBase.CallStateHasChangedOnAsyncCompletion（任务）
位于Microsoft.AspNetCore.Components.RenderTree.Renderer.GetErrorHandledTask（TaskTaskToHandle）blazor.server.js:15:27309
日志https://localhost:44348/_framework/blazor.server.js:15
Chttps://localhost:44348/_framework/blazor.server.js:8
shttps://localhost:44348/_framework/blazor.server.js:8
invokeClientMethodhttps://localhost:44348/_framework/blazor.server.js:1
invokeClientMethodhttps://localhost:44348/_framework/blazor.server.js:1
处理输入数据https://localhost:44348/_framework/blazor.server.js:1
收到https://localhost:44348/_framework/blazor.server.js:1
onmessagehttps://localhost:44348/_framework/blazor.server.js:1
（异步：EventHandlerNonNull）
连接https://localhost:44348/_framework/blazor.server.js:1
连接https://localhost:44348/_framework/blazor.server.js:1
shttps://localhost:44348/_framework/blazor.server.js:1
shttps://localhost:44348/_framework/blazor.server.js:1
Lhttps://localhost:44348/_framework/blazor.server.js:1
Lhttps://localhost:44348/_framework/blazor.server.js:1
连接https://localhost:44348/_framework/blazor.server.js:1
startTransporthttps://localhost:44348/_framework/blazor.server.js:1
createTransporthttps://localhost:44348/_framework/blazor.server.js:1
shttps://localhost:44348/_framework/blazor.server.js:1
shttps://localhost:44348/_framework/blazor.server.js:1
Bhttps://localhost:44348/_framework/blazor.server.js:1
Bhttps://localhost:44348/_framework/blazor.server.js:1
createTransporthttps://localhost:44348/_framework/blazor.server.js:1
星形内部https://localhost:44348/_framework/blazor.server.js:1
shttps://localhost:44348/_framework/blazor.server.js:1
shttps://localhost:44348/_framework/blazor.server.js:1
A.https://localhost:44348/_framework/blazor.server.js:1
（异步：承诺回调）
Chttps://localhost:44348/_framework/blazor.server.js:1
Bhttps://localhost:44348/_framework/blazor.server.js:1
Bhttps://localhost:44348/_framework/blazor.server.js:1
星形内部https://localhost:44348/_framework/blazor.server.js:1
开始https://localhost:44348/_framework/blazor.server.js:1
shttps://localhost:44348/_framework/blazor.server.js:1
shttps://localhost:44348/_framework/blazor.server.js:1
Bhttps://localhost:44348/_framework/blazor.server.js:1
Bhttps://localhost:44348/_framework/blazor.server.js:1
开始https://localhost:44348/_framework/blazor.server.js:1
星形内部https://localhost:44348/_framework/blazor.server.js:1
shttps://localhost:44348/_framework/blazor.server.js:1
shttps://localhost:44348/_framework/blazor.server.js:1
vhttps://localhost:44348/_framework/blazor.server.js:1
vhttps://localhost:44348/_framework/blazor.server.js:1
星形内部https://localhost:44348/_framework/blazor.server.js:1
startwithstate转换https://localhost:44348/_framework/blazor.server.js:1
shttps://localhost:44348/_framework/blazor.server.js:1
shttps://localhost:44348/_framework/blazor.server.js:1
vhttps://localhost:44348/_framework/blazor.server.js:1
vhttps://localhost:44348/_framework/blazor.server.js:1
startwithstate转换https://localhost:44348/_fr
[2019-12-27T08:58:22.819Z] Error: System.InvalidOperationException: Microsoft.AspNetCore.Components.Forms.InputSelect`1[System.Nullable`1[System.Byte]] does not support the type 'System.Nullable`1[System.Byte]'.

   at Microsoft.AspNetCore.Components.Forms.InputSelect`1.TryParseValueFromString(String value, TValue& result, String& validationErrorMessage)

   at Microsoft.AspNetCore.Components.Forms.InputBase`1.set_CurrentValueAsString(String value)

   at Microsoft.AspNetCore.Components.Forms.InputSelect`1.<BuildRenderTree>b__4_0(String __value)

   at Microsoft.AspNetCore.Components.EventCallbackFactoryBinderExtensions.<>c__DisplayClass22_0`1.<CreateBinderCore>b__0(ChangeEventArgs e)

--- End of stack trace from previous location where exception was thrown ---

   at Microsoft.AspNetCore.Components.ComponentBase.CallStateHasChangedOnAsyncCompletion(Task task)

   at Microsoft.AspNetCore.Components.RenderTree.Renderer.GetErrorHandledTask(Task taskToHandle) blazor.server.js:15:27309
    log https://localhost:44348/_framework/blazor.server.js:15
    C https://localhost:44348/_framework/blazor.server.js:8
    S https://localhost:44348/_framework/blazor.server.js:8
    invokeClientMethod https://localhost:44348/_framework/blazor.server.js:1
    invokeClientMethod https://localhost:44348/_framework/blazor.server.js:1
    processIncomingData https://localhost:44348/_framework/blazor.server.js:1
    onreceive https://localhost:44348/_framework/blazor.server.js:1
    onmessage https://localhost:44348/_framework/blazor.server.js:1
    (Async: EventHandlerNonNull)
    connect https://localhost:44348/_framework/blazor.server.js:1
    connect https://localhost:44348/_framework/blazor.server.js:1
    s https://localhost:44348/_framework/blazor.server.js:1
    s https://localhost:44348/_framework/blazor.server.js:1
    L https://localhost:44348/_framework/blazor.server.js:1
    L https://localhost:44348/_framework/blazor.server.js:1
    connect https://localhost:44348/_framework/blazor.server.js:1
    startTransport https://localhost:44348/_framework/blazor.server.js:1
    createTransport https://localhost:44348/_framework/blazor.server.js:1
    s https://localhost:44348/_framework/blazor.server.js:1
    s https://localhost:44348/_framework/blazor.server.js:1
    B https://localhost:44348/_framework/blazor.server.js:1
    B https://localhost:44348/_framework/blazor.server.js:1
    createTransport https://localhost:44348/_framework/blazor.server.js:1
    startInternal https://localhost:44348/_framework/blazor.server.js:1
    s https://localhost:44348/_framework/blazor.server.js:1
    s https://localhost:44348/_framework/blazor.server.js:1
    a https://localhost:44348/_framework/blazor.server.js:1
    (Async: promise callback)
    c https://localhost:44348/_framework/blazor.server.js:1
    B https://localhost:44348/_framework/blazor.server.js:1
    B https://localhost:44348/_framework/blazor.server.js:1
    startInternal https://localhost:44348/_framework/blazor.server.js:1
    start https://localhost:44348/_framework/blazor.server.js:1
    s https://localhost:44348/_framework/blazor.server.js:1
    s https://localhost:44348/_framework/blazor.server.js:1
    B https://localhost:44348/_framework/blazor.server.js:1
    B https://localhost:44348/_framework/blazor.server.js:1
    start https://localhost:44348/_framework/blazor.server.js:1
    startInternal https://localhost:44348/_framework/blazor.server.js:1
    s https://localhost:44348/_framework/blazor.server.js:1
    s https://localhost:44348/_framework/blazor.server.js:1
    v https://localhost:44348/_framework/blazor.server.js:1
    v https://localhost:44348/_framework/blazor.server.js:1
    startInternal https://localhost:44348/_framework/blazor.server.js:1
    startWithStateTransitions https://localhost:44348/_framework/blazor.server.js:1
    s https://localhost:44348/_framework/blazor.server.js:1
    s https://localhost:44348/_framework/blazor.server.js:1
    v https://localhost:44348/_framework/blazor.server.js:1
    v https://localhost:44348/_framework/blazor.server.js:1
    startWithStateTransitions https://localhost:44348/_framework/blazor.server.js:1
    start https://localhost:44348/_framework/blazor.server.js:1
    S https://localhost:44348/_framework/blazor.server.js:8
    s https://localhost:44348/_framework/blazor.server.js:8
    s https://localhost:44348/_framework/blazor.server.js:8
    r https://localhost:44348/_framework/blazor.server.js:8
    r https://localhost:44348/_framework/blazor.server.js:8
    S https://localhost:44348/_framework/blazor.server.js:8
    E https://localhost:44348/_framework/blazor.server.js:8
    s https://localhost:44348/_framework/blazor.server.js:8
    s https://localhost:44348/_framework/blazor.server.js:8
    r https://localhost:44348/_framework/blazor.server.js:8
    r https://localhost:44348/_framework/blazor.server.js:8
    E https://localhost:44348/_framework/blazor.server.js:8
    <anonymous> https://localhost:44348/_framework/blazor.server.js:8
    n https://localhost:44348/_framework/blazor.server.js:1
    <anonymous> https://localhost:44348/_framework/blazor.server.js:1
    <anonymous> https://localhost:44348/_framework/blazor.server.js:1