在寫網路程式時，常常會有從一個模板裡取代特定值並且輸出 html 或 json 的需求。如果是輸出 json，通常會從物件直接 json，但 html 比較沒辦法做到。以這兩種格式而言，其實要做的事情是一樣的。
假設有一個 json template：
{"responseData":
{
"result":{
"id1": 1,
"id2": "2",
"id3": 3,
"test" : "{key:test}",
"testArray": [{key:testArray}]
},
"retrunCode": "0",
"method": "{key:method}",
"service": "money"
}
}
程式要做的事很簡單，就是將裡面的 {key:test}、{key:testArray}、{key:method} 給替換掉，方法如下：
public string CreateJsonResponse(HybridDictionary table, string DataFormatFilePath)
{
StringBuilder strResult = null;
StreamReader reader = new StreamReader(DataFormatFilePath);
strResult = new StringBuilder(reader.ReadToEnd());
foreach (string key in table.Keys)
{
if (table[key].GetType().IsArray)
{
List<string> strList = new List<string>();
string[] strOutputArray = (string[])table[key];
foreach (string element in strOutputArray)
{
strList.Add("\"" + element + "\"");
}
strResult.Replace("{key:" + key + "}", string.Join(",", strList.ToArray()));
}
else
{
strResult.Replace("{key:" + key + "}", table[key].ToString());
}
}
return strResult.ToString();
}
測試程式碼：
CreateData creater = new CreateData();
HybridDictionary hdData = new HybridDictionary();
hdData.Add("test", "test value");
hdData.Add("method", "test method");
string[] array = new string[] { "1", "2", "3" };
hdData.Add("testArray", array);
Console.WriteLine(creater.CreateJsonResponse(hdData, "response.json"));
執行結果：
如果實作 GUI 介面讓一般人員操作，就得從模板中取出所有的 key 並且列出來，方法如下：
public string[] GetKeyListFromTemplate(string DataFormatFilePath)
{
List<string> listResult = new List<string>();
string template = null;
StreamReader reader = new StreamReader(DataFormatFilePath);
template = reader.ReadToEnd();
string pattern = @"\{(key\:)[A-Za-z0-9]*}";
Regex reg = new Regex(pattern, RegexOptions.IgnoreCase);
MatchCollection matches = reg.Matches(template);
foreach (Match match in matches)
{
listResult.Add(match.Value.Replace("{key:", "").Replace("}", ""));
}
return listResult.ToArray();
}
測試程式碼：
CreateData creater = new CreateData();
HybridDictionary hdData = new HybridDictionary();
foreach (string key in creater.GetKeyListFromTemplate("response.json"))
{
Console.WriteLine(key);
}
執行結果：
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