需要帮助计算可重复的等号和加法运算符事件

本文关键字：事件 运算符 帮助 计算 | 更新日期: 2023-09-27 18:29:01

我正在使用MVVM模式构建一个UWP计算器应用程序，除了如何让equals按钮重复计算并使我的操作员按钮正确工作外，我几乎已经解决了所有问题。我可以做其中一个，但我不知道如何同时做这两个。下面的代码适用于可重复的等于按钮，但在添加多个值时，加号运算符将产生错误的答案。

如果我去掉第二个switch语句，并将变量改回使用一个Output变量，那么我可以让加号运算符工作，但equals按钮在重复时会失败。

我确信这只是一个添加嵌套if语句或在某个地方添加bool的问题，但我被难住了！请帮忙。我去掉了非必要的按钮和操作器。如果您对我的代码有任何其他有用的建议，我们也将不胜感激。非常感谢。

public class ComputareViewModel : ViewModelBase
{
    #region Private Fields
    private double resultNumber = 0;
    private double xResultNumber;
    private double yResultNumber;
    private string _outputValue = "0";
    bool isOperationPerformed = false;
    bool EqualsRepeated = false;

    public ComputareViewModel()
    {
    }
    public string OutputValue
    {
        get
        {
            return _outputValue;
        }
        set
        {
            _outputValue = value;
            OnPropertyChanged("OutputValue");
        }
    }
    public void OnNumberBtnClick(object sender, RoutedEventArgs args)
    {
        if ((_outputValue) == "0" || (isOperationPerformed))
            _outputValue = "";
        isOperationPerformed = false;
        Button numberBtnClick = (Button)sender;
        if ((string)numberBtnClick.Content == ".")
        {
            if (!_outputValue.Contains("."))
            {
                    OutputValue = OutputValue + numberBtnClick.Content;
            }
        }
        else
        {
                OutputValue = OutputValue + numberBtnClick.Content;
        }
    }
    public void OnOperatorBtnClick(object sender, RoutedEventArgs args)
    {
        Button operatorBtnClick = (Button)sender;
        if(isOperationPerformed == false)
        {
            if (xResultNumber != 0)
            {
                OnEqualsBtnClick(this, new RoutedEventArgs());
                operationPerformed = (string)operatorBtnClick.Content;
                isOperationPerformed = true;
                EqualsRepeated = false;
            }
            else
            {
                operationPerformed = (string)operatorBtnClick.Content;
                xResultNumber = Double.Parse(OutputValue);
                isOperationPerformed = true;
            }
        }
        else
        {
            //Do nothing.
        }
    }
    public void OnEqualsBtnClick(object sender, RoutedEventArgs args)
    {
        if (EqualsRepeated == false)
        {
            if (double.TryParse(OutputValue, out yResultNumber))
                switch (operationPerformed)
                {
                    case "+":
                        {
                            OutputValue = (xResultNumber + yResultNumber).ToString();
                            break;
                        }
                }
            isOperationPerformed = true;
            EqualsRepeated = true;
        }
        else
        {
            // If equals has already been clicked
            if (EqualsRepeated == true)
                if (double.TryParse(OutputValue, out xResultNumber))
                    switch (operationPerformed)
                    {
                        case "+":
                            {
                                OutputValue = (xResultNumber + yResultNumber).ToString();
                                break;
                            }
                    }
        }
        isOperationPerformed = true;
    }
}

需要帮助计算可重复的等号和加法运算符事件

您的代码中存在一些逻辑问题。首先，在调用OnEqualsBtnClick之后，isOperationPerformed为true，如果您想调用OnOperatorBtnClick，它将始终转到else部分，而不执行任何操作。其次，如果您重复单击euqal按钮，xResultNumber不是0，如果您想调用OnOperatorBtnClick，它会调用OnEqualsBtnClick，但EqualsRepeated现在是真的，所以您应该将EqualsRepeated更改为false。最后，xResultNumber是上次计算的值，您应该在OnEqualsBtnClick方法中将其设置为0。

所以你可以这样更改你的代码：

public void OnOperatorBtnClick(object sender, RoutedEventArgs args)
{
    Button operatorBtnClick = (Button)sender;
    EqualsRepeated = false;
    if (isOperationPerformed == false)
    {
        if (xResultNumber != 0)
        {
            OnEqualsBtnClick(this, new RoutedEventArgs());
            operationPerformed = (string)operatorBtnClick.Content;
            isOperationPerformed = true;
            EqualsRepeated = false;
        }
        else
        {
            operationPerformed = (string)operatorBtnClick.Content;
            xResultNumber = Double.Parse(OutputValue);
            isOperationPerformed = true;
        }
    }
    else
    {
        //Do nothing. 
    }
}
public void OnEqualsBtnClick(object sender, RoutedEventArgs args)
{
    if (EqualsRepeated == false)
    {
        if (double.TryParse(OutputValue, out yResultNumber))
            switch (operationPerformed)
            {
                case "+":
                    {
                        OutputValue = (xResultNumber + yResultNumber).ToString();
                        break;
                    }
            }
        isOperationPerformed = true;
        EqualsRepeated = true;
    }
    else
    {
        // If equals has already been clicked
        if (EqualsRepeated == true)
            if (double.TryParse(OutputValue, out xResultNumber))
                switch (operationPerformed)
                {
                    case "+":
                        {
                            OutputValue = (xResultNumber + yResultNumber).ToString();
                            break;
                        }
                }
    }
    isOperationPerformed = false;
    xResultNumber = 0;
}
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