如何在C#中使用字体权重之间的相等运算符

本文关键字：之间 权重 运算符 字体 | 更新日期: 2023-09-27 18:27:24

我必须在CustomControl中创建一个FontWeight属性，但它在控制FontWeights时出错。我该如何解决？

财产登记：

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'

谢谢。

如何在C#中使用字体权重之间的相等运算符

根据我从文档页面上可以看出的情况（信息惊人地缺乏和/或我很难找到详细的注释），FontWeight是一个struct值类型，它没有为==定义运算符，因此您无法直接比较它们。

然而，我认为您可以比较它们的底层封装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（同样是可爱的文档），但你可以创建一个扩展方法，给你一些看起来不太好的语法：

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;

我不确定，但您可以在将转换为字符串后进行比较。。即

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