Question

我目前正在尝试为新的线程增加堆栈大小，以便我可以在下面运行我的方法，而不会让应用程序抛出 StackOverflowException

public QuoteResult CalculateRates(TruckDb db, QuoteData data)
{
    var result = new QuoteResult
    {
        Successful = false,
        Data = data
    };

    //...EDIT with code samples

        //Floor - 1
        var qisg = new QuoteItemSectionGroup
        {
            SectionGroup = db.SectionGroups.Where(x => x.Name == "Longitudinals" && x.Section == TruckSection.Floor).First(),
            StockItem = quoteItem.FloorSpec.Name == "Ali Floor Bakery" || quoteItem.FloorSpec.Name == "Trailer Floor" || quoteItem.FloorSpec.Name == "Use Existing Floor" ? null : quoteItem.BodyType.Name == "Insulated" || quoteItem.BodyType.Name == "Insulated Meat Hanger" ? db.StockItems.Where(x => x.StockCode == "SCH095").First()
                : quoteItem.BodyType.Name == "Royal Corrugated" || quoteItem.BodyType.Name == "Royal Smooth Glued" || quoteItem.BodyType.Name == "Royal Smooth Riveted" ||
                quoteItem.BodyType.Name == "Royal Tautliner" || quoteItem.BodyType.Name == "Penta Slider Curtain-side" || quoteItem.BodyType.Name == "Bakery Light Weight GRP" ||
                quoteItem.BodyType.Name == "Free Flow Bakery Body" || quoteItem.BodyType.Name == "Boardside GRP Body" || quoteItem.BodyType.Name == "Drop Side" || quoteItem.BodyType.Name == "Flat Deck" ? quoteItem.ChassisModel.Longitudinal : null
        };
        qisg.Quantity = qisg.StockItem == null ? 0 : 2;
        qisg.Length = qisg.StockItem == null ? 0 : Math.Round((quoteItem.BodyType.Name == "Royal Corrugated" || quoteItem.BodyType.Name == "Royal Smooth Glued" || quoteItem.BodyType.Name == "Smooth Folded" || quoteItem.BodyType.Name == "Royal Smooth Riveted" || quoteItem.BodyType.Name == "Bakery Light Weight GRP" || quoteItem.BodyType.Name == "Free Flow Bakery Body" || quoteItem.BodyType.Name == "Boardside GRP Body" || quoteItem.BodyType.Name == "Insulated" || quoteItem.BodyType.Name == "Insulated Meat Hanger" || quoteItem.BodyType.Name == "Drop Side" || quoteItem.BodyType.Name == "Flat Deck" ? -0.157
            : quoteItem.BodyType.Name == "Penta Slider Curtain-side" ? -0.150 : quoteItem.BodyType.Name == "Royal Tautliner" ? -0.060
            : 0) + (quoteItem.ExternalLength / 1000), 3);
        qisg.Weight = qisg.StockItem == null ? 0 : Math.Round(((double)qisg.Length * (double)qisg.Quantity) * (double)qisg.StockItem.Mass, 3);
        qisg.Cost = qisg.StockItem == null ? 0 : Math.Round(((double)qisg.Length * (double)qisg.Quantity) * (double)qisg.StockItem.UnitCost, 2);
        if (qisg.StockItem != null)
            quoteItem.SectionGroups.Add(qisg);

        //Floor - 2
        qisg = new QuoteItemSectionGroup
        {
            SectionGroup = db.SectionGroups.Where(x => x.Name == "Cross Member" && x.Section == TruckSection.Floor).First(),
            StockItem = quoteItem.FloorSpec.Name == "Ali Floor Bakery" || quoteItem.FloorSpec.Name == "Trailer Floor" || quoteItem.FloorSpec.Name == "Use Existing Floor" ? null : quoteItem.BodyType.Name == "Insulated" || quoteItem.BodyType.Name == "Insulated Meat Hanger" || quoteItem.BodyType.Name == "Penta Slider Curtain-side" ? db.StockItems.Where(x => x.StockCode == "SCH095").First()
                : quoteItem.BodyType.Name == "Royal Corrugated" || quoteItem.BodyType.Name == "Royal Smooth Glued" || quoteItem.BodyType.Name == "Royal Smooth Riveted" || quoteItem.BodyType.Name == "Royal Tautliner" || quoteItem.BodyType.Name == "Bakery Light Weight GRP" ||
                quoteItem.BodyType.Name == "Free Flow Bakery Body" || quoteItem.BodyType.Name == "Boardside GRP Body" || quoteItem.BodyType.Name == "Drop Side" || quoteItem.BodyType.Name == "Flat Deck" ? db.StockItems.Where(x => x.StockCode == "SCH075").First() : null
        };
        qisg.Quantity = qisg.StockItem == null ? 0 : Math.Floor(quoteItem.BodyType.Name == "Insulated" || quoteItem.BodyType.Name == "Insulated Meat Hanger" || quoteItem.BodyType.Name == "Royal Corrugated"
            || quoteItem.BodyType.Name == "Royal Smooth Glued" || quoteItem.BodyType.Name == "Royal Smooth Riveted" || quoteItem.BodyType.Name == "Royal Tautliner"
            || quoteItem.BodyType.Name == "Bakery Light Weight GRP" || quoteItem.BodyType.Name == "Free Flow Bakery Body" || quoteItem.BodyType.Name == "Boardside GRP Body" || quoteItem.BodyType.Name == "Drop Side" || quoteItem.BodyType.Name == "Flat Deck" ? ((quoteItem.ExternalLength / quoteItem.FloorChannelSpacing.Amount) + 2) 
            : quoteItem.BodyType.Name == "Penta Slider Curtain-side" ? (quoteItem.ExternalLength / quoteItem.FloorChannelSpacing.Amount) : 0);
        qisg.Length = qisg.StockItem == null ? 0 : Math.Round((quoteItem.BodyType.Name == "Royal Corrugated" || quoteItem.BodyType.Name == "Royal Smooth Glued" || quoteItem.BodyType.Name == "Smooth Folded" || quoteItem.BodyType.Name == "Royal Smooth Riveted" || quoteItem.BodyType.Name == "Bakery Light Weight GRP" || quoteItem.BodyType.Name == "Free Flow Bakery Body" || quoteItem.BodyType.Name == "Boardside GRP Body" || quoteItem.BodyType.Name == "Insulated" || quoteItem.BodyType.Name == "Insulated Meat Hanger" || quoteItem.BodyType.Name == "Drop Side" || quoteItem.BodyType.Name == "Flat Deck" ? -0.020
            : quoteItem.BodyType.Name == "Penta Slider Curtain-side" ? -0.070 : quoteItem.BodyType.Name == "Royal Tautliner" ? -0.030
            : 0) + (quoteItem.ExternalWidth / 1000), 3);
        qisg.Weight = qisg.StockItem == null ? 0 : Math.Round(((double)qisg.Length * (double)qisg.Quantity) * (double)qisg.StockItem.Mass, 3);
        qisg.Cost = qisg.StockItem == null ? 0 : Math.Round(((double)qisg.Length * (double)qisg.Quantity) * (double)qisg.StockItem.UnitCost, 2);
        if (qisg.StockItem != null)
            quoteItem.SectionGroups.Add(qisg);   

    //It continues on like this with about 80 more blocks of code like the above samples          

    result.Successful = true;
    return result;
}

我尝试过以人们在其他问题中提出的几种方式进行编码，但我无法弄清楚如何在新线程中使用我的方法。

以下是我的尝试之一：

void NewThread(QuoteResult result)
{
    const int stackSize = 0x400000;
    var T = new Thread(CalculateRates, stackSize);
    T.Start();
    T.Join();
}

但是，它抛出了错误：

最佳重载方法匹配＆＃39; System.Threading.Thread.Thread（System.Threading.ParameterizedThreadStart， INT）＆＃39;有一些无效的论点

你可以清楚地看到，我不知道我在做什么或如何为我的方法创建一个新线程，所以我确实期待很多批评。如果有人需要更多代码示例或信息，请不要犹豫。

提前感谢您的帮助！

抱歉，如果这是一个模糊的问题

修改

也使用 CalculateRates 方法的方法：

public QuoteResult GetQuote(QuoteData Data)
{
    using (TruckDb db = new TruckDb())
    {
        var result = CalculateRates(db, Data);
        return result;
    }
}

和

    public bool FinalizeQuote(QuoteResult quoteResult)
    {
        using (TruckDb db = new TruckDb())
        {
            var calcResult = CalculateRates(db, quoteResult.Data);

            //Make sure that result still gives the same amount and that they where successful calculations
            if (calcResult.TotalAmount != quoteResult.TotalAmount || !quoteResult.Successful || !calcResult.Successful)
                return false;

            var company = db.Companies.Where(x => x.Name == "Test Co.").FirstOrDefault();
            if (company == null)
                company = db.Companies.Add(new Company { Name = "Test Co." });

            var rep = company.Represetatives.Where(x => x.Name == "Person").FirstOrDefault();
            if (rep == null)
            {
                rep = new Represetative { Name = "Person" };
                company.Represetatives.Add(rep);
            }
            var quote = new Quote { Date = DateTime.Now, QuoteNumber = DateTime.Now.ToString() };
            rep.Quotes.Add(quote);

            quote.Items.Add(calcResult.QuoteItem);


            db.SaveChanges();
        }
        return true;
    }

Answer 1

您没有传递参数CalculateRates需要。

您可以通过传入一个简单的lambda表达式来完成此操作：

void NewThread(QuoteResult result)
{
    //example for creating the parameters to pass in
    TruckDb db = new TruckDb();
    QuoteData data = new QuoteData();

    const int stackSize = 0x400000;
    var T = new Thread(() => CalculateRates(db, data), stackSize);
    T.Start();
    T.Join();
}

Answer 2

您可以使用Task

参考上述链接Task

Answer 3

除了上面提到的那些人之外，你有一个简单的语法错误。

您没有传递Thread方法的参数＆＃34; CalculateRates＆＃34;。 Thread方法应该只有一个类型＆＃34; object＆＃34;的参数。您可以传入，例如

var t = new Thread(new ParameterizedThreadStart(youmethod);
t.Start(yourparam);

另一种解决方案是使用闭包。但一般来说，你只是没有传递你试图调用的方法的参数。

检查来自MSDN的示例： https://msdn.microsoft.com/en-us/library/system.threading.parameterizedthreadstart%28v=vs.110%29.aspx

为方法创建新线程

3 个答案: