C# 绑定(bind)对象到字符串

Question

我想将动态对象绑定(bind)到字符串，例如将字符串中的 instance.field 替换为实例的实际值。

请参阅下面的代码以了解:

String body = "My Name is: model.Name";
Model model = new Model();
model.Name = "Mohammed";
String result = ReplaceMethod(body,model);
// result is, My Name is: Mohammed

注意:我想在具有太多字段的大字符串值中使用此过程。谢谢。

Answer 1

我不会在像“model.Name”这样的字符串中使用前缀，我会立即使用{Name}。我们需要的是找到所有这些，Regex 可以帮助我们。

试试这个方法，查看评论:

class Program
{
    static void Main(string[] args)
    {
        String body = "My Name is: {Name} {LastName}";
        Model model = new Model();
        model.Name = "Mohammed";
        model.LastName = "LastName";
        String result = ReplaceMethod(body, model);
    }

    private static string ReplaceMethod(string body, Model model)
    {
        // can't name property starting with numbers, 
        // but they are possible
        Regex findProperties = new Regex(@"{([a-zA-Z]+[0-9]*)}");

        // order by desc, since I want to replace all substrings correctly
        // after I replace one part length of string is changed 
        // and all characters at Right are moved forward or back
        var res = findProperties.Matches(body)
            .Cast<Match>()
            .OrderByDescending(i => i.Index);

        foreach (Match item in res)
        {
            // get full substring with pattern "{Name}"
            var allGroup = item.Groups[0];

            //get first group this is only field name there
            var foundPropGrRoup = item.Groups[1];
            var propName = foundPropGrRoup.Value;

            object value = string.Empty;

            try
            {
                // use reflection to get property
                // Note: if you need to use fields use GetField
                var prop = typeof(Model).GetProperty(propName);

                if (prop != null)
                {
                    value = prop.GetValue(model, null);
                }
            }
            catch (Exception ex)
            {
                //TODO Logging here
            }

            // remove substring with pattern
            // use remove instead of replace, since 
            // you may have several the same string
            // and insert what required
            body = body.Remove(allGroup.Index, allGroup.Length)
                .Insert(allGroup.Index, value.ToString());

        }

        return body;
    }

    public class Model
    {
        public string Name { get; set; }
        public string LastName { get; set; }
    }
}