WPF、文本框验证和仅绑定列表中的一项<string>

我正试图重构我的代码。目前,我的Validator类拥有10个不同的字符串,每个字符串表示不同文本框的内容。

// The string contained in the TextBox.
private string MasterPointName => null;

// Other strings...
....

// The validator.
public string this[string columnName]
{
    string result = null;

    get
    {
        switch (columnName)
        {
            case "MasterPointName":
            if (string.IsNullOrEmpty(this.MasterPointName))
            {
                result = "This field must not be left empty!";
            }

            break;

            // Other case statements...
            ...
        }

        return result;
    }
}

这是上述文本框之一的XAML:

<TextBox x:Name="tbMaster" Validation.Error="ValidationError" Text="{Binding UpdateSourceTrigger=PropertyChanged, Path=MasterPointName, ValidatesOnDataErrors=true, NotifyOnValidationError=true}" />

现在我想把我所有的弦放在一个 List<string>

private readonly List<string> points = new List<string>
                          {
                              "masterPointName",
                              ...
                          };

// The validator.
public string this[string columnName]
{
    string result = null;

    get
    {
        switch (columnName)
        {
            case "masterPointName":
            if (string.IsNullOrEmpty(this.points[0]))
            {
                result = "This field must not be left empty!";
            }

            break;

            // Other case statements...
            ...
        }

        return result;
    }
}

更新的XAML(使用 Path=points[0] ):

<TextBox x:Name="tbMaster" Validation.Error="ValidationError" Text="{Binding UpdateSourceTrigger=PropertyChanged, Path=points[0], ValidatesOnDataErrors=true, NotifyOnValidationError=true}" />

this 回答,但我可能遗漏了什么。我想达到的目标可能实现吗?这有什么意义吗?