General search in DataGrid or in ObservableCollection

Question

Hello,

I am traing to make a search function which finds in UWP DataGrid or in attached ObservableCollection, any string. Search should be made by specified property.
This work I must to do using general programming .

I started with such code but I stuck.

        public class MyObservableCollection<T> : ObservableCollection<T>
        {
            public int Find(string propertyName, string textToFind)
                    {
                int index;

                //body here

                return index;
            }
            }

please help.

Answer 1

Hello, Welcome to Micorosoft Q&A,

Search should be made by specified property.

For your scenario, I have completed code, please refer the following to filter your collection.

public class MyObservableCollection<T> : ObservableCollection<T>  
{  
    public int Find(string propertyName, string textToFind)  
    {  
        int index = -1;  
  
        var FilteredItems = this.Where(item => GetPropertyValue(item, propertyName).ToString().IndexOf(textToFind, StringComparison.InvariantCultureIgnoreCase) >= 0);  
  
        foreach (var item in FilteredItems)  
        {  
            index = this.IndexOf(item);  
        }  
        // we suggest your return FilteredItems, or it will reture last one's index of current collection from FilteredItems  
        return index;  
    }  
  
    object GetPropertyValue(T entity, string propetyName)  
    {  
        object result = null;  
        Type entityType = typeof(T);  
        try  
        {  
            PropertyInfo proInfo = entityType.GetProperty(propetyName);  
            result = proInfo.GetValue(entity);  
        }  
        catch (Exception)  
        {  
  
            throw;  
        }  
        return result;  
    }  
  
}  

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