Dynamic string interpolation

Question

Can anyone help me with this?

Required Output: "Todo job for admin"

class Program {     static void Main(string[] args)     {         Console.WriteLine(ReplaceMacro("{job.Name} job for admin", new Job { Id = 1, Name = "Todo", Description="Nothing" }));         Console.ReadLine();     }      static string ReplaceMacro(string value, Job job)     {         return value; //Output should be "Todo job for admin"     } }  class Job {     public int Id { get; set; }     public string Name { get; set; }     public string Description { get; set; } } 

Answer 1

Two suggestions:

DataBinder.Eval

string ReplaceMacro(string value, Job job) {     return Regex.Replace(value, @"{(?<exp>[^}]+)}", match => {         return (System.Web.UI.DataBinder.Eval(new { Job = job }, match.Groups["exp"].Value) ?? "").ToString();     }); } 

Linq.Expression

Use the Dynamic Query class provided in the MSDN LINQSamples:

string ReplaceMacro(string value, Job job) {     return Regex.Replace(value, @"{(?<exp>[^}]+)}", match => {         var p = Expression.Parameter(typeof(Job), "job");         var e = System.Linq.Dynamic.DynamicExpression.ParseLambda(new[] { p }, null, match.Groups["exp"].Value);         return (e.Compile().DynamicInvoke(job) ?? "").ToString();     }); } 

In my opinion, the Linq.Expression is more powerful, so if you trust the input string, you can do more interesting things, i.e.:

value = "{job.Name.ToUpper()} job for admin" return = "TODO job for admin" 

Answer 2

You can't use string interpolation this way. But you can still use the pre-C#6 way to do it using string.Format:

static void Main(string[] args) {     Console.WriteLine(ReplaceMacro("{0} job for admin", new Job { Id = 1, Name = "Todo", Description = "Nothing" }));     Console.ReadLine(); }  static string ReplaceMacro(string value, Job job) {     return string.Format(value, job.Name); }