C#使用不可变的集合或减少字段的可访问性&x27；创建ContactMapping'；

我在一个旧项目中遇到了一个类问题，我不知道如何重构这个部分，我从sonarcube得到了以下错误消息：

Use an immutable collection or reduce the accessibility of the field(s) 'CreateContactMapping'.Why is this an issue?

这是一段代码

public static readonly Dictionary<string, Func<UpdateContactServiceRequest, object>> UpdateContactMapping = new Dictionary<string, Func<UpdateContactServiceRequest, object>>
        {
            { "firstname", req => req.FirstName },
            { "lastname", req => req.LastName },
            { "full_name", req => req.FullName },
            { "email", req => req.Email },
            { "phone", req => req.Phone },
            { "date_of_birth", req => req.BirthDate },
            { "job_title", req => req.JobTitle },
            { "occupation", req => req.Occupation },
            { "renda", req => req.MonthlyIncome },
            { "lifecyclestage", req => req.LifeCycleStage },
            { "hs_lead_status", req => req.LeadStatus },
            { "ali_email_validated", req => req.EmailValidated },
            { "ali_sms_token_validated", req => req.CellphoneValidated },
            { "id_da_proposta_atual", req => req.CurrentProposalId },
            { "contact_type", req => req.ContactType }
        };

公共静态只读字典UpdateContactMapping=新字典 { {“firstname”，req=>req.firstname}， {“lastname”，req=>req.lastname}， {“全名”，req=>req.FullName}， {“email”，req=>req.email}， {“phone”，req=>req.phone}， {“出生日期”，req=>req.BirthDate}， {“job_title”，req=>req.JobTitle}， {“占领”，req=>req.occulation}， {“renda”，req=>req.MonthlyIncome}， {“LifecycleState”，req=>req.LifecycleState}， {“hs_lead_status”，req=>req.LeadStatus}， {“ali_email_validated”，req=>req.EmailValidated}， {“ali_sms_token_validated”，req=>req.CellphoneValidated}， {“id_da_proposta_atual”，req=>req.CurrentProposalId}， {“contact_type”，req=>req.ContactType} };

---

如何最好地解决此问题？

一种解决方案可以是将

字典

更改为

不可变字典

，然后在初始化字典后运行

.ToImmutableDictionary（）

public static readonly ImmutableDictionary UpdateContactMapping=新字典
{
{“firstname”，req=>req.firstname}，
{“lastname”，req=>req.lastname}，
{“全名”，req=>req.FullName}，
{“email”，req=>req.email}，
{“phone”，req=>req.phone}，
{“出生日期”，req=>req.BirthDate}，
{“job_title”，req=>req.JobTitle}，
{“占领”，req=>req.occulation}，
{“renda”，req=>req.MonthlyIncome}，
{“LifecycleState”，req=>req.LifecycleState}，
{“hs_lead_status”，req=>req.LeadStatus}，
{“ali_email_validated”，req=>req.EmailValidated}，
{“ali_sms_token_validated”，req=>req.CellphoneValidated}，
{“id_da_proposta_atual”，req=>req.CurrentProposalId}，
{“contact_type”，req=>req.ContactType}
}.ToImmutableDictionary（）；

这解决了我的问题，非常感谢！