c# - 重复方法调用模型的不同属性

Question

是否可以简化这段代码？我正在将值列表中的数据转换为同一个对象。在每种方法中，被求和的属性都会发生变化。

属性每次都遵循相同的命名约定(paios 或 pa)后跟(InUse 或 SuportInUse ).我知道在 JavaScript 中我可以生成字符串并评估字符串，但据我所知在 C# 中没有类似的东西。

public class CompanyLicValues
{
    public int Paios;
    public int Papc;
    public int Paplus;
    public int Eis;
    public int Pd;
    public int Dropoff;

    public CompanyLicValues SumInUse(List<vwCompany> companies)
    {
        Paios = companies.Sum(x => x.paiosInUse); //<<<The property being summed changes
        Papc = companies.Sum(x => x.papcInUse); //<<<The property being summed changes
        ....
        return this;
    }

    public CompanyLicValues SumSupportUsed(List<vwCompany> companies)
    {
        Paios = companies.Sum(x => x.paiosSupportInUse); //<<<The property being summed changes
        Papc = companies.Sum(x => x.papcSupportInUse); //<<<The property being summed changes
        ...
        return this;
    }
 }

Answer 1

您可以使用反射来获取属性，然后找到要使用的属性

public class CompanyLicValues
{
    public int Paios { get; private set; }
    public int Papc { get; private set; }


    public CompanyLicValues SumInUse(List<VwCompany> companies)
    {
        SumDynamically(companies, "InUse");
        return this; return this;
    }

    public CompanyLicValues SumSupportUsed(List<VwCompany> companies)
    {
        SumDynamically(companies, "SupportInUse");
        return this;
    }

    private void SumDynamically(IReadOnlyCollection<VwCompany> companies, string propertySuffix)
    {
        Paios = SumProperty(companies, $"{nameof(Paios)}{propertySuffix}");
        Papc = SumProperty(companies, $"{nameof(Papc)}{propertySuffix}");
    }

    private static int SumProperty(IEnumerable<VwCompany> companies, string propertyName)
    {
        var properties = typeof(VwCompany).GetProperties(); //cache properties
        var p = properties.FirstOrDefault(x => x.Name == propertyName && x.GetMethod.ReturnType == typeof(int));
        if (p is null) throw new Exception("Property Not found");

        return companies.Sum(x => (int)p.GetValue(x));
    }
}