Question

在这里寻找一些一般性的指导。基本上我正在使用EF Code First MVC模型构建一个项目，并且我有一个包含许多方法的类，我想使用If语句在其他两个方法中基于值设置一个方法的值。

我搜索过每一个地方，一直在看书，做教程等，但似乎没有人能够覆盖我想要做的事情。我怀疑我错过了一些明显的东西，或者我无法实现我正在做的事情。

以下代码的摘录 - 我试图根据概率和严重性字段中的值设置评级字段的值。我已经尝试修改get和set语句，在构造函数中设置等。

using System;
using System.Collections.Generic;
using System.ComponentModel.DataAnnotations;
using System.Linq;
using System.Web;

namespace PSA.Models
{
    public class Issue
    {
        public virtual int IssueID { get; set; }
        [Required(ErrorMessage = "Title is Required.")]
        public virtual string Title { get; set; }
        public virtual string Description { get; set; }
        public virtual string Type { get; set; }
        public virtual string Classification { get; set; }
        public virtual bool Internal { get; set; }
        public virtual int ProbableStatusId { get; set; }
        public virtual ProbableStatus ProbableStatus{ get; set; }
        public virtual int SeverityStatusId { get; set; }
        public virtual SeverityStatus SeverityStatus { get; set; }

        [Display(Name = "Due Date")]
        [DataType(DataType.Date)]
        public virtual DateTime DueDate { get; set; }

        [Display(Name = "Assigned To")]
        public int StakeholderID { get; set; }
        public virtual Stakeholder Stakeholder { get; set; }
        [Display(Name= "Customer")]
        public int CustomerID { get; set; }

        public virtual Customer Customer { get; set; }
        [DataType(DataType.Date)]
        [ScaffoldColumn(false)]
        public virtual DateTime DateSubmitted { get; set; }
        public virtual string Rating { get; set; }


        // Constructor used to initialise any new instance of Date Submitted with System Date and Time
        public Issue()
        {
            this.DateSubmitted = DateTime.Now;
        }

   }

}

Answer 1

您可以创建计算属性：

[NotMapped]
public virtual SeverityStatus SeverityStatus
{
    get
    {
        // Implement your calculation logic here
        if (ProbableStatusId == 1 && SeverityStatusId == 1)
            return new SeverityStatus();
        // ...
    }
}

注意：您不能在构造函数中执行此操作，因为两个相关属性为null。另一种解决方案是创建方法

Answer 2

谢谢大家 - 答案是设置条件并在get语句中返回。很简单我真的不明白get语句对我做了什么。

代码如下所示：

using System;
using System.Collections.Generic;
using System.ComponentModel.DataAnnotations;
using System.Linq;
using System.Web;

namespace PSA.Models
{
    public class Issue
    {
        public virtual int IssueID { get; set; }
        [Required(ErrorMessage = "Title is Required.")]
        public virtual string Title { get; set; }
        public virtual string Description { get; set; }
        public virtual string Type { get; set; }
        public virtual string Classification { get; set; }
        public virtual bool Internal { get; set; }
        public virtual int ProbableClassificationId { get; set; }
        public virtual ProbableClassification ProbableClassification { get; set; }
        public virtual int SeverityClassificationId { get; set; }
        public virtual SeverityClassification SeverityClassification { get; set; }
        string ratingstatus;
        public virtual string Rating 
        {
            get 
            {
                if (ProbableClassification != null && SeverityClassification != null)
                {
                    if (SeverityClassification.Severity == "Minor")
                    {
                        ratingstatus = "Low";
                    }
                    if (ProbableClassification.Probability == "Not Likely" && SeverityClassification.Severity == "Medium")
                    {
                        ratingstatus = "Low";
                    }
                    if (ProbableClassification.Probability == "Likely" && SeverityClassification.Severity == "Medium")
                    {
                        ratingstatus = "Medium";
                    }
                    if (ProbableClassification.Probability == "Definitely" && SeverityClassification.Severity == "Medium")
                    {
                        ratingstatus = "Medium";
                    }
                    if (ProbableClassification.Probability == "Not Likely" && SeverityClassification.Severity == "Major")
                    {
                        ratingstatus = "Low";
                    }
                    if (ProbableClassification.Probability == "Likely" && SeverityClassification.Severity == "Major")
                    {
                        ratingstatus = "High";
                    }
                    if (ProbableClassification.Probability == "Definitely" && SeverityClassification.Severity == "Major")
                    {
                        ratingstatus = "Crtical";
                    }

                }
            return ratingstatus;
            }
            set
            {
                ratingstatus = value;
            }
        }

        [Display(Name = "Due Date")]
        [DataType(DataType.Date)]
        public virtual DateTime DueDate { get; set; }

        [Display(Name = "Assigned To")]
        public int StakeholderID { get; set; }
        public virtual Stakeholder Stakeholder { get; set; }
        [Display(Name = "Customer")]
        public int CustomerID { get; set; }

        public virtual Customer Customer { get; set; }
        [DataType(DataType.Date)]
        [ScaffoldColumn(false)]
        public virtual DateTime DateSubmitted { get; set; }
        public Issue()
        {
            this.DateSubmitted = DateTime.Now;
        }




    }
}

EF Code First MVC设置方法的默认值

2 个答案: