generic-string-to-class.cs

using System.ComponentModel.DataAnnotations;
using System.Runtime.Serialization;


void Main()
{
	var input = "1234567890ABCDEFGHIJKLMNOPQRSTUVWXYZ1234567890ABCDEFGHIJKLMNOPQRSTUVWXYZ1234567890ABCDEFGHIJKLMNOPQRSTUVWXYZ";
	var test = Adapter<Test>(input);
	Console.WriteLine(test);
}

public T Adapter<T>(string input) where T : class, new()
{
	var obj = new T();
	var type = obj.GetType();
	
	var properties = type
		.GetProperties()
		.Select((x, i) => new {
			Name = x.Name,
			Length = x.GetCustomAttributes(typeof(StringLengthAttribute), false).Cast<StringLengthAttribute>().SingleOrDefault()?.MaximumLength ?? 1,
			Order = x.GetCustomAttributes(typeof(DataMemberAttribute), false).Cast<DataMemberAttribute>().SingleOrDefault()?.Order ?? i
		}).OrderBy(x => x.Order);
		
	var length = properties.Sum(x => x.Length);
	if(input.Length < length)
		input = input.PadRight(length, ' ');
		
	var idx = 0;
	foreach(var property in properties)
	{
		var prop = type.GetProperty(property.Name);
		prop.SetValue(obj, input.Substring(idx, property.Length), null);
		idx += property.Length;
	}
	
	return obj;
}

[DataContract]
public class Test
{
	[DataMember(Order = 0, Name = "TestFieldOne", IsRequired = true), StringLength(2)]
	public string Field1 { get; set; }
	[DataMember(Order = 1, Name = "TestFieldTwo", IsRequired = true), StringLength(7)]
	public string Field2 { get; set; }
	[DataMember(Order = 2, Name = "TestFieldThree", IsRequired = true), StringLength(5)]
	public string Field3 { get; set; }
	[DataMember(Order = 3, Name = "TestFieldFour", IsRequired = true), StringLength(10)]
	public string Field4 { get; set; }
	[DataMember(Order = 4, Name = "TestFieldFive", IsRequired = true), StringLength(1)]
	public string Field5 { get; set; }
	[DataMember(Order = 5, Name = "TestFieldSix", IsRequired = true), StringLength(1)]
	public string Field6 { get; set; }
	[DataMember(Order = 6, Name = "TestFieldSeven", IsRequired = true), StringLength(8)]
	public string Field7 { get; set; }
	[DataMember(Order = 7, Name = "TestFieldEight", IsRequired = true), StringLength(270)]
	public string Field8 { get; set; }
	[DataMember(Order = 8, Name = "TestFieldNine", IsRequired = true), StringLength(12)]
	public string Field9 { get; set; }
	[DataMember(Order = 9, Name = "TestFieldTen", IsRequired = true), StringLength(27)]
	public string Field10 { get; set; }
}

results.md

Test
Field1	12
Field2	3456789
Field3	0ABCD
Field4	EFGHIJKLMN
Field5	O
Field6	P
Field7	QRSTUVWX
Field8	YZ1234567890ABCDEFGHIJKLMNOPQRSTUVWXYZ1234567890ABCDEFGHIJKLMNOPQRSTUVWXYZ
Field9
Field10