将哈希表转换为对象列表

Question

我们如何将哈希表转换为对象列表？可能吗？

业务对象：-

[Serializable]
public class ColourEntry
{
    public string Id 
    {
        get { return this.id; }
        set { this.id= value; }
    }
    public string Name
    {
        get { return this.name; }
        set { this.name= value; }
    }
    public Hashtable Properties
    {
        get { return this.properties; }
        set { this.properties = value; }
    }
}

数据合同：-

[DataContract(Name = "Color", Namespace = Constants.Namespace)]
public class ColorContract
{
    [DataMember(EmitDefaultValue = false)]
    public string Id { get; set; }

    [DataMember(EmitDefaultValue = false)]
    public string Name { get; set; }

    [DataMember(EmitDefaultValue = false)]
    public List<PropertiesContract> Properties { get; set; }
}

[DataContract(Name = "Properties", Namespace = Constants.Namespace)]
public class PropertiesContract
{
    [DataMember(EmitDefaultValue = false)]
    public string Key { get; set; }

    [DataMember(EmitDefaultValue = false)]
    public string Value { get; set; }
}

业务对象到数据协定 Mapper 函数：-

public static List<ColorContract> MapContract(IList<ColourEntry> colourEntryList)
{
    var colorContract = colourEntryList.Select(x => new ColorContract()
    {
        Id = x.Id.ToDisplayString(),
        Name = x.Name,
        Properties = x.Properties
    }
    return colorContract;
 }

这给了我

的错误

"Error Cannot implicitly convert type 'System.Collections.Hashtable' to 'System.Collections.Generic.List'"

因为 ColorEntry 是具有哈希表属性的对象。

我也试过 x.Properties.ToList() 但这些也不起作用。

Answer 1

代码中的 HashTable 在哪里？我假设它是 ColourEntry class 中的属性 Properties。所以您想将 HashTable 转换为 List<PropertiesContract>.

我想这就是你想要的 (hashTable.Cast<DictionaryEntry>):

var colorContract = colourEntryList.Select(x => new ColorContract()
{
    Id = x.Id.ToDisplayString(),
    Name = x.Name,
    Properties = x.Properties
        .Cast<DictionaryEntry>()
        .Select(kv => new PropertiesContract{ Key = kv.Key.ToString(), Value = kv.Value?.ToString() })
        .ToList()
}
return colorContract;

将哈希表转换为对象列表

Convert Hashtable to List of Objects

c#

linq

hashtable

list

object