如何将cloudformation template yaml反序列化为C#字符串字典？

using Amazon.CloudFormation;
using Amazon.CloudFormation.Model;
using System.IO;
using System.Collections.Generic;
using System;

public Dictionary<string, string> DeserializeCloudFormationTemplate(string templateFilePath)
{
    var cfnClient = new AmazonCloudFormationClient();
    
    // 读取模板文件
    var templateContent = File.ReadAllText(templateFilePath);
    
    // 构建请求对象
    var request = new ValidateTemplateRequest
    {
        TemplateBody = templateContent
    };
    
    // 发起请求，获取模板的解析结果
    var response = cfnClient.ValidateTemplate(request);
    
    // 将解析结果存储到字符串字典中
    var result = new Dictionary<string, string>();
    foreach (var parameter in response.Parameters)
    {
        result.Add(parameter.ParameterKey, parameter.DefaultValue);
    }
    
    return result;
}

string templateFilePath = "path/to/template.yaml";
var dictionary = DeserializeCloudFormationTemplate(templateFilePath);