[英]Converting Data in a C# List from one type to another.
我想更好地学习Linq,所以如果这是一个愚蠢的问题,我会提前道歉。
给定以下类别:
class FormData
{
public string CustomerId {get; set;}
public string FieldId {get; set;}
public string FieldValue {get; set;}
}
class CustomerDetails
{
public string CustomerId {get; set;}
public FormField[] Fields {get; set;}
}
class FormField
{
public string FieldId {get; set;}
public string FieldValue {get; set;}
}
我正在尝试转换此数据
// example incoming data set
List<FormData> formData = new List<FormData> {
new FormData { CustomerId = 1, FieldId = "FirstName", FieldValue = "Peter" },
new FormData { CustomerId = 1, FieldId = "LastName", FieldValue = "Smith" },
new FormData { CustomerId = 1, FieldId = "PetsName", FieldValue = "Spot" },
new FormData { CustomerId = 2, FieldId = "FirstName", FieldValue = "Dougie" },
new FormData { CustomerId = 2, FieldId = "LastName", FieldValue = "Fresh" },
new FormData { CustomerId = 2, FieldId = "PetsName", FieldValue = "Skittles" },
new FormData { CustomerId = 3, FieldId = "FirstName", FieldValue = "Sam" },
new FormData { CustomerId = 3, FieldId = "LastName", FieldValue = "Reynolds" },
new FormData { CustomerId = 3, FieldId = "PetsName", FieldValue = "Taco" }
};
对此
// desired out going data set
List<CustomerDetails> customerDetails = new List<CustomerDetails> {
new CustomerDetails {
CustomerId : 1,
Fields : [
new FormField {FieldId = "FirstName", FieldValue = "Peter"},
new FormField {FieldId = "LastName", FieldValue = "Smith"},
new FormField {FieldId = "PetsName", FieldValue = "Spot"}
]
},
new CustomerDetails {
CustomerId : 2,
Fields : [
new FormField {FieldId = "FirstName", FieldValue = "Dougie"},
new FormField {FieldId = "LastName", FieldValue = "Fresh"},
new FormField {FieldId = "PetsName", FieldValue = "Skittles"}
]
},
new CustomerDetails {
CustomerId : 3,
Fields : [
new FormField {FieldId = "FirstName", FieldValue = "Sam"},
new FormField {FieldId = "LastName", FieldValue = "Reynolds"},
new FormField {FieldId = "PetsName", FieldValue = "Taco"}
]
}
};
这是我目前的操作方式...有更好的方法吧?
var customerIds = formData.Distinct().Select(x => x.CustomerId).ToList();
var results = new List<CustomerDetails>();
foreach (var id in customerIds)
{
var customerDetails = new CustomerDetails();
customerDetails.CustomerId = id;
var fields = new List<GuestItemDataFieldResult>();
foreach (var f in formData.Where(x => x.CustomerId == id))
{
var field = new FormField();
field.FirstName = f.FirstName;
field.LastName = f.LastName;
field.PetsName = f.PetsName;
fields.Add(field);
}
customerDetails.Fields = fields.ToArray();
results.Add(customerDetails);
}
干得好:
var newData =
formData.GroupBy(g1 => g1.CustomerId)
.Select(
s1 =>
new CustomerDetails
{
CustomerId = s1.Key.ToString(),
Fields =
s1.Select(s2 => new FormField {
FieldId = s2.FieldId,
FieldValue = s2.FieldValue})
.ToArray()
});
声明:本站的技术帖子网页,遵循CC BY-SA 4.0协议,如果您需要转载,请注明本站网址或者原文地址。任何问题请咨询:yoyou2525@163.com.