参数异常参数值超出范围十进制

Question

在数据库中price 列设置为decimal(20, 2)。

表示它可以保存小数点前18位和小数点后2位。对吧？

现在，当我尝试保存价值 12345678.00 时，它会显示：parameter value is out of range

我做错了什么？

更新：

123456.00 is saved in db.
1234567.00 gives exception

例外：

System.Data.Entity.Infrastructure.DbUpdateException：更新条目时出错。有关详细信息，请参阅内部异常。 ---> System.Data.Entity.Core.UpdateException：更新条目时出错。有关详细信息，请参阅内部异常。 ---> System.ArgumentException：参数值“12345678.00”超出范围。在 System.Data.SqlClient.TdsParser.TdsExecuteRPC（SqlCommand cmd，_SqlRPC[] rpcArray，Int32 超时，布尔 inSchema，SqlNotificationRequest 通知请求，TdsParserStateObject stateO0bj，布尔 isCommandProc，布尔同步，TaskCompletionSource1 completion, Int32 startRpc, Int32 startParam) at System.Data.SqlClient.SqlCommand.RunExecuteReaderTds(CommandBehavior cmdBehavior, RunBehavior runBehavior, Boolean returnStream, Boolean async, Int32 timeout, Task& task, Boolean asyncWrite, Boolean inRetry, SqlDataReader ds, Boolean describeParameterEncryptionRequest) at System.Data.SqlClient.SqlCommand.RunExecuteReader(CommandBehavior cmdBehavior, RunBehavior runBehavior, Boolean returnStream, String method, TaskCompletionSource1 完成，Int32 超时，任务和任务， Boolean& usedCache, Boolean asyncWrite, Boolean inRetry) at System.Data.SqlClient.SqlCommand.InternalExecuteNonQuery(TaskCompletionSource1 completion, String methodName, Boolean sendToPipe, Int32 timeout, Boolean& usedCache, Boolean asyncWrite, Boolean inRetry) at System.Data.SqlClient.SqlCommand.BeginExecuteNonQueryInternal(CommandBehavior behavior, AsyncCallback callback, Object stateObject, Int32 timeout, Boolean inRetry, Boolean asyncWrite) at System.Data.SqlClient.SqlCommand.BeginExecuteNonQueryAsync(AsyncCallback callback, Object stateObject) at System.Threading.Tasks.TaskFactory1.FromAsyncImpl(Func3 beginMethod, Func2 endFunction, Action1 endAction, Object state, TaskCreationOptions creationOptions) at System.Threading.Tasks.TaskFactory1.FromAsync(Func3 beginMethod, Func2 endMethod,对象状态）在 System.Data.SqlClient.SqlCommand.ExecuteNonQueryAsync(CancellationToken cancelToken) --- 从先前抛出异常的位置结束堆栈跟踪---在 System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task) 在系统System.Data.Entity.Utilities.TaskExtensions.CultureAwaiter1.GetResult() at System.Data.Entity.Core.Mapping.Update.Internal.DynamicUpdateCommand.<ExecuteAsync>d__0.MoveNext() --- End of stack trace from previous location where exception was thrown --- at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task) at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) at System.Data.Entity.Core.Mapping.Update.Internal.UpdateTranslator.<UpdateAsync>d__0.MoveNext() --- End of inner exception stack trace --- at System.Data.Entity.Core.Mapping.Update.Internal.UpdateTranslator.<UpdateAsync>d__0.MoveNext() --- End of stack trace from previous location where exception was thrown --- at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task) at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) at System.Data.Entity.Core.Objects.ObjectContext.<ExecuteInTransactionAsync>d__3d1.MoveNext() 处的 .Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification（任务任务） - -- 从先前引发异常的位置结束堆栈跟踪 --- 在 System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) 在 System.Data.Entity 的 System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task) .Core.Objects.ObjectContext.d__39.MoveNext() --- 在 System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task) 的 System.Runtime.CompilerServices 处从先前引发异常的位置结束堆栈跟踪。 System.Data.Entity.SqlServer.DefaultSqlExecutionStrategy.d__91.MoveNext() --- End of stack trace from previous location where exception was thrown --- at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task) at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) at System.Data.Entity.Core.Objects.ObjectContext.<SaveChangesInternalAsync>d__31.MoveNext() --- End of inner exception stack trace --- at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task) at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) at System.Runtime.CompilerServices.TaskAwaiter1.GetResult() 处的 TaskAwaiter.HandleNonSuccessAndDebuggerNotification（任务任务）

更新：

我创建了一个新数据库并运行迁移以确保 db 列正是我所期望的，它是：

完整代码：

Ad.cs：

[Table("ad")]
public class Ad
{
        [Key, DatabaseGenerated(DatabaseGeneratedOption.None), Column("id")]
        public Guid Id { get; set; }
        [Column("price")]
        public decimal Price { get; set; }
        //other attributes
}

DbMigration 类：

public partial class added_price_to_ad : DbMigration
    {
        public override void Up()
        { 
            AddColumn("dbo.ad", "price", c => c.Decimal(nullable: false, precision: 20, scale: 2));
        }

        public override void Down()
        { 
            DropColumn("dbo.ad", "images_count");
        }
    }

AdVm.cs：

public class AdVm
    {
        public string Id { get; set; }
        [DisplayFormat(ApplyFormatInEditMode = true, DataFormatString = 
        "{0:#.#}")]
        public decimal Price { get; set; }
        //other attributes
    }

create.cshtml:

@model ProjectName.ViewModels.AdVm
@using (Html.BeginForm("Save", "Ads", FormMethod.Post, new { id = "CreateAdForm" }))
                    {
                        @Html.AntiForgeryToken()

                        <div class="form-horizontal">
                            @Html.ValidationSummary(true)
                            @Html.HiddenFor(x => x.Id)

<div class="form-group">
                                @Html.LabelFor(model => model.Price, new { @class = "control-label col-md-2" })
                                <div class="col-md-10">
                                    @Html.EditorFor(model => model.Price)
                                    @Html.ValidationMessageFor(model => model.Price)
                                </div>
                            </div>

                        </div>
                       <input type="submit"/>
                    }

控制器：

    [HttpPost]
            [ValidateAntiForgeryToken]
    public async Task<ActionResult> Save(AdVm adVm)
   {
       var ad= Mapper.Map<AdVm, Ad>(adVm);
       db.Ads.Add(ad);
       await db.SaveChangesAsync(); //throws exception here
       return RedirectToAction("Details", new { id= ad.Id });
    }

Answer 1

检查 db 中的价格数据类型，可能你在 db 中使用了不同的数据类型