如何动态设置MVC模型中的默认值

Question

我有一个类Projects，其定义如下：

public enum ContractFreq
{
    [Display(Name="Monthly")]
    M = 1,
    [Display(Name="Quarterly")]
    Q = 2,
    [Display(Name="Anually")]
    A = 3,
    [Display(Name="One-Time")]
    X = 4
}

public partial class Project
{
    [Key]
    [Display(Name="Project")]
    public int ProjectID { get; set; }
    [Display(Name = "Contract Frequency")]
    public ContractFreq ContractFreq { get; set; }
    [Required]
    public string Description { get; set; }
    [ForeignKey("Vendor")]
    public int VendorID { get; set; }
    public int Cost { get; set; }
    [Display(Name = "Project Start Date")]
    public DateTime? DateStarted { get; set; }
    [Display(Name = "Project Name")]

    private String _ProjectName = Vendor.VendorName + " - [" + Description + "]";
    [Display(Name = "Project Name")]
    public String ProjectName
    {
        get
        {
            return _ProjectName;
        }
        set
        {
            this._ProjectName = Vendor.VendorName + " - [" + this.Description + "]";
        }
    }
    /*
    public string ProjectName
    {
        get
        {
            return Vendor.VendorName + " - [" + Description + "]";
        }
    }
     */


    /* Navigation */
    public virtual Vendor Vendor { get; set; }
    public virtual ICollection<PurchReq> PurchReqs { get; set; }
    public virtual ICollection<Invoice> Invoices { get; set; }

    public Project()
    {
        DateStarted = System.DateTime.Now;
        PurchReqs = new HashSet<PurchReq>();
    }

我想将字段“ProjectName”作为Vendor.VendorName和Project.Description的连接。我知道字符串参数不能为空。什么是实现这个的最简单，最简单的方法？我原来用过：

        public string ProjectName
    {
        get
        {
            return Vendor.VendorName + " - [" + Description + "]";
        }
    }

但是我无法将linq与非静态字段一起使用，并且想知道是否有更好的方法。

Answer 1

它可以是这样的：

[Display(Name = "Project Name")]
public String ProjectName
{
    get
    {
        return string.Format("{0} - [{1}]", Vendor.VendorName, Description );
    }
}

并且没有静态成员read this。