Question

我必须在CustomControl中创建一个FontWeight属性，但它在控制FontWeights时给出了错误。我该如何解决？

物业注册：

public static readonly DependencyProperty FontWeightProperty =
        DependencyProperty.Register(
            "FontWeight",
            typeof(int),
            typeof(WatermarkTextBox),
        new PropertyMetadata(0));

属性（我们可以更改此属性，这是我的业余工作）：

    private int _watermarkFontWeight = 0;

    public int WatermarkFontWeight
    {
        get
        {
            if (watermarkPassTextBox.FontWeight == FontWeights.Normal)
            {
                _watermarkFontWeight = 0;
            }
            else if (watermarkPassTextBox.FontWeight == FontWeights.SemiBold)
            {
                _watermarkFontWeight = 1;
            }
            else if (watermarkPassTextBox.FontWeight == FontWeights.Bold)
            {
                _watermarkFontWeight = 2;
            }
            else if (watermarkPassTextBox.FontWeight == FontWeights.ExtraBold)
            {
                _watermarkFontWeight = 3;
            }
            return _watermarkFontWeight;
        }
        set
        {
            if (value == 0)
            {
                SetProperty<int>(ref _watermarkFontWeight, value, "FontWeight");
                watermarkPassTextBox.FontWeight = FontWeights.Normal;
            }
            else if (value == 1)
            {
                SetProperty<int>(ref _watermarkFontWeight, value, "FontWeight");
                watermarkPassTextBox.FontWeight = FontWeights.SemiBold;
            }
            else if (value == 2)
            {
                SetProperty<int>(ref _watermarkFontWeight, value, "FontWeight");
                watermarkPassTextBox.FontWeight = FontWeights.Bold;
            }
            else if (value == 3)
            {
                SetProperty<int>(ref _watermarkFontWeight, value, "FontWeight");
                watermarkPassTextBox.FontWeight = FontWeights.ExtraBold;
            }
        }
    }

错误：

Operator '==' cannot be applied to operands of type 'Windows.UI.Text.FontWeight' and 'Windows.UI.Text.FontWeight'

感谢。

Answer 1

据我所知documentation page（令人惊讶地缺乏信息和/或我无法找到详细的结果），FontWeight是一个struct值类型，不为==定义运算符，因此您无法直接比较它们。

但是，我认为您可以比较其基础包裹的Weight值：

if (watermarkPassTextBox.FontWeight.Weight == FontWeights.Normal.Weight)

编辑：我不确定他们的Equals实现是否有效（再次，可爱的文档），但您可以创建一个扩展方法，为您提供一些看起来不太合适的语法：

public static bool Equals(this FontWeight weight1, FontWeight weight2)
{
    return weight1.Weight == weight2.Weight;
}

导致使用：

if (watermarkPassTextBox.FontWeight.Equals(FontWeights.Normal))
    _watermarkFontWeight = 0;
else if (watermarkPassTextBox.FontWeight.Equals(FontWeights.SemiBold))
    _watermarkFontWeight = 1;
else if (watermarkPassTextBox.FontWeight.Equals(FontWeights.Bold))
    _watermarkFontWeight = 2;
else if (watermarkPassTextBox.FontWeight.Equals(FontWeights.ExtraBold))
    _watermarkFontWeight = 3;
else
    return _watermarkFontWeight;

Answer 2

我不确定，但你可以尝试在转换之后进行比较转换为字符串 .. 即

if (Convert.Tostring(watermarkPassTextBox.FontWeight) == Convert.Tostring(FontWeights.Normal))
        {....}

如何在C＃中使用FontWeights之间的Equal Operator？

2 个答案: