.NET-将列表转换/映射为对象，反之亦然 [英] .NET - Convert/map list into object and vis versa

问题描述

我有以下列表，其中包含字段名称和值.

I have the following list which contains field names and values.

public class FormField 
{
    public string FieldName { get; set;}
    public string FieldValue { get; set;}
}

var formData = new List<FormField>();
formData.Add(new FormField { FieldName = "Date", FieldValue = "2017-09-14" });
formData.Add(new FormField { FieldName = "Name", FieldValue = "Job blogs" });
formData.Add(new FormField { FieldName = "IsEnabled", FieldValue = "true" });

如何将列表转换或映射到以下类?注意FieldNames映射到该类的属性.

How can I convert or map the list into the following class? Note FieldNames map to the properties of the class.

public class MyViewModel 
{
    [Required]
    public DateTime Date { get; set; } = DateTime.now;

    [Required]
    public string Name { get; set; }

    public boolean IsEnabled { get; set; }

    public IEnumerable<SelectListItem> Titles 
    {
        get
        {
            var options = new List<SelectListItem>
            {
                new SelectListItem(){ Value = "Mr", Text = "Mr" },
                new SelectListItem(){ Value = "Mrs", Text = "Mrs" }                    
            };

            return options;
        }
    } 
}

任何帮助表示赞赏.我是否需要以某种方式序列化列表? automapper可以这样做吗?

Any help appreciated. Do I need to serialize the list somehow? Can automapper do this?

*更新*

我尝试了以下操作，但是尽管automapper文档指出您可以直接从字典访问对象，但它还是不起作用:

I tried the following but it doesnt work despite the automapper docs stating that you can go directly from dictionary to object:

public class MappingProfile : Profile
{
    public MappingProfile()
    {
        CreateMap<Dictionary<string, object>, MyViewModel>();
    }
}

var viewModel = Mapper.Map<MyViewModel>(formData.ToDictionary(x => x.FieldName, x => (object) x.FieldValue))

注意:我使用automapper v 5.0.2进行记录

Note: for the record I'm using automapper v 5.0.2

我还需要从对象回到字典，但是能够排除诸如public IEnumerable<SelectListItem> Titles {get;}

I also need to go back from object to dictionary but be able to exclude properties such as public IEnumerable<SelectListItem> Titles {get;}

推荐答案

您可以使用反射来获取和设置模型中的匹配属性

You could use reflection to get and set the matching properties in the model

var formData = new List<FormField>();
formData.Add(new FormField { FieldName = "Date", FieldValue = "2017-09-14" });
formData.Add(new FormField { FieldName = "Name", FieldValue = "Job blogs" });
formData.Add(new FormField { FieldName = "IsEnabled", FieldValue = "true" });

// Initialize a new instance of the model
MyViewmodel model = new MyViewmodel();
// Get its property info
PropertyInfo[] properties = model.GetType().GetProperties();
// Loop through your form field data
foreach(var field in formData)
{
    // Get the matching property name
    PropertyInfo pi = properties.FirstOrDefault(x => x.Name == field.FieldName);
    if (pi == null)
    {
        continue;
    }
    // Convert the value to match the property type
    object value = Convert.ChangeType(field.FieldValue, pi.PropertyType);
    // Set the value of the property
    pi.SetValue(model, value);
}

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