DictionaryParameter.cs

using System;
using System.Collections.Generic;
using System.ComponentModel;

public class DictionaryParameter
{
    private readonly Dictionary<string, object> _parameters = new Dictionary<string, object>(StringComparer.OrdinalIgnoreCase);

    public DictionaryParameters(object param)
    {
        if (param == null) return;
        AddValues(param);
    }

    public IDictionary<string, object> Parameters => _parameters;

    private void AddValues(object values)
    {
        foreach (PropertyDescriptor descriptor in TypeDescriptor.GetProperties(values))
        {
            Add(descriptor.Name, descriptor.GetValue(values));
        }
    }

    public void Add(string key, object value)
    {
        _parameters.Add($"@{key}", value);
    }
}

public static class KeyValueParameterExtensions
{ 
    //Another apporach using Lazy pattern IEnumerable<KeyvVluePair<string,object>>
    public static IEnumerable<KeyValuePair<string, object>> ToKeyValueList(this object param)
    {
        if (param == null) yield break;
        foreach (PropertyDescriptor descriptor in TypeDescriptor.GetProperties(param))
        {
            yield return new KeyValuePair<string, object>($"@{descriptor.Name}", descriptor.GetValue(param));
        }
    }
}

ex : 
var param = new {ApplicationName = "FFF",minDate = "ff",Another = 1,CreateDate = DateTime.Now,ABC = Guid.NewGuid(),AnotherGuid = Guid.NewGuid()}.ToKeyValueList();
var dict = new DictionaryParameters(new {ApplicationName = "FFF",minDate = "ff",Another = 1,CreateDate = DateTime.Now,ABC = Guid.NewGuid(),AnotherGuid = Guid.NewGuid()}.ToKeyValues());
var dictParameters = dict.Parameters;