C# Datatable、DbDataReader等转化json
作者：互联网
//对象转换为Json字符串
public static string ToJson(object jsonObject)
{
object objectValue = string.Empty;
string jsonString = "{";
if (jsonObject==null)
{
return jsonString + "}";
}
PropertyInfo[] propertyInfo = jsonObject.GetType().GetProperties();
for (int i = 0; i < propertyInfo.Length; i++)
{
try
{
objectValue = propertyInfo[i].GetGetMethod().Invoke(jsonObject, BindingFlags.InvokeMethod, null, new object[] { }, null);
string value = string.Empty;
if (objectValue is DateTime || objectValue is Guid || objectValue is TimeSpan)
{
value = "'" + objectValue.ToString() + "'";
}
else if (objectValue is string)
{
value = "'" + ToJson(objectValue.ToString()) + "'";
}
else if (objectValue is IEnumerable)
{
value = ToJson((IEnumerable)objectValue);
}
else
{
value = ToJson(objectValue.ToString());
}
jsonString += "\"" + ToJson(propertyInfo[i].Name) + "\":" + value + ",";
}
catch (Exception ex)
{
string s = ex.Message;
}
}
jsonString.Remove(jsonString.Length - 1);
return jsonString + "}";
}
//对象集合转换Json
public static string ToJson(IEnumerable array)
{
if (array == null) return "";
string jsonString = "[";
foreach (object item in array)
{
jsonString+= ToJson(item) + ",";
}
jsonString.Remove(jsonString.Length - 1);
return jsonString + "]";
}
//普通集合转换Json
public static string ToArrayString(IEnumerable array)
{
if (array == null) return "";
string jsonString = "[";
foreach (object item in array)
{
jsonString = ToJson(item.ToString()) + ",";
}
jsonString.Remove(jsonString.Length - 1, jsonString.Length);
return jsonString + "]";
}
//Datatable转换为Json
public static string ToJson(DataTable dt)
{
if (dt == null || dt.Rows.Count == 0) return "[{}]";
StringBuilder jsonString = new StringBuilder();
jsonString.Append("[");
DataRowCollection drc = dt.Rows;
for (int i = 0; i < drc.Count; i++)
{
jsonString.Append("{");
for (int j = 0; j < dt.Columns.Count; j++)
{
string strKey = dt.Columns[j].ColumnName;
string strValue = drc[i][j].ToString();
Type type = dt.Columns[j].DataType;
jsonString.Append("\"" + strKey + "\":");
strValue = StringFormat(strValue, type);
if(j<dt.Columns.Count-1)
jsonString.Append(strValue + ",");
else
jsonString.Append(strValue);
}
jsonString.Append("},");
}
jsonString.Remove(jsonString.Length - 1, 1);
jsonString.Append("]");
return jsonString.ToString();
}
//DataTable转成Json
public static string ToJson(DataTable dt, string jsonName)
{
if(string.IsNullOrEmpty(jsonName))
jsonName = dt.TableName;
StringBuilder sb = new StringBuilder();
sb.Append("{\"" + jsonName + "\":[");
if (dt.Rows.Count > 0)
{
for (int i = 0; i < dt.Rows.Count; i++)
{
sb.Append("{");
for (int j = 0; j < dt.Columns.Count; j++)
{
Type type = dt.Rows[i][j].GetType();
sb.Append("\"" + dt.Columns[j].ColumnName.ToString() + "\":" + StringFormat(dt.Rows[i][j].ToString(), type));
if (j < dt.Columns.Count - 1)
{
sb.Append(",");
}
}
sb.Append("}");
if (i < dt.Rows.Count - 1)
{
sb.Append(",");
}
}
}
sb.Append("]}");
return sb.ToString();
}
//DataReader转换为Json
public static string ToJson(DbDataReader dataReader)
{
StringBuilder jsonString = new StringBuilder();
jsonString.Append("[");
while (dataReader.Read())
{
jsonString.Append("{");
for (int i = 0; i < dataReader.FieldCount; i++)
{
Type type = dataReader.GetFieldType(i);
string strKey = dataReader.GetName(i);
string strValue = dataReader[i].ToString();
jsonString.Append("\"" + strKey + "\":");
strValue = StringFormat(strValue, type);
if (i < dataReader.FieldCount - 1)
{
jsonString.Append(strValue + ",");
}
else
{
jsonString.Append(strValue);
}
}
jsonString.Append("},");
}
dataReader.Close();
jsonString.Remove(jsonString.Length - 1, 1);
jsonString.Append("]");
return jsonString.ToString();
}
//DataSet转换为Json
public static string ToJson(DataSet dataSet)
{
string jsonString = "{";
foreach (DataTable table in dataSet.Tables)
{
jsonString += "\"" + table.TableName + "\":" + ToJson(table) + ",";
}
jsonString = jsonString.TrimEnd(',');
return jsonString + "}";
}
//ArrayList转化为json
public static string ArryListToJson(ArrayList alist, string jsonName)
{
string json = string.Empty;
string strSubList = "\"" + jsonName + "\":" + "[{";
for (int i = 0; i < alist.Count; i++)
{
Hashtable ht1 = (Hashtable)alist[i];
foreach (DictionaryEntry de in ht1)
{
if (de.Value is ArrayList)
{
strSubList += ArryListToJson((ArrayList)de.Value, de.Key.ToString());
strSubList += "]";
}
else
{
strSubList += "\"" + de.Key + "\":" + "\"" + de.Value + "\",";
}
}
strSubList = strSubList.Remove(strSubList.Length - 1);
strSubList += "},{";
}
if (strSubList.Length >= 2)
{
json = strSubList.Remove(strSubList.Length - 2);
}
json += "]";
return json;
}
//Hashtable To Json
public static string HashtableToJson(Hashtable hr)
{
string json = "{";
foreach (DictionaryEntry row in hr)
{
try
{
string key = "\"" + row.Key + "\":";
string value = string.Empty;
if (row.Value is ArrayList)
{
key = string.Empty;
value = ArryListToJson((ArrayList)row.Value, row.Key.ToString());
value += ",";
}
else
{
value = "\"" + (row.Value == null ? "" : row.Value.ToString()) + "\",";
}
json += key + value;
}
catch (Exception ex)
{
string mess = ex.Message;
}
}
json = json.Remove(json.Length - 1);
json = json + "}";
return json;
}
//转换字符格式
private static string StringFormat(string str, Type type)
{
if (string.IsNullOrEmpty(str)) return "\"\"";
if (type == typeof(string))
{
str = "\"" + ConvertStrToSpecificationStrs(str) + "\"";
}
else if (type == typeof(DateTime))
{
str = "\"" + str + "\"";
}
else if (type == typeof(bool))
{
str = str.ToLower();
}
return str;
}
//转换字符格式
public static string ConvertStrToSpecificationStrs(string str)
{
if (string.IsNullOrEmpty(str)) return "";
StringBuilder sb = new StringBuilder();
for (int i = 0; i < str.Length; i++)
{
char cStr = str.ToCharArray()[i];
switch (cStr)
{
case '\"':
sb.Append("\\\""); break;
case '\\':
sb.Append("\\\\"); break;
case '/':
sb.Append("\\/"); break;
case '\b':
sb.Append("\\b"); break;
case '\f':
sb.Append("\\f"); break;
case '\n':
sb.Append("\\n"); break;
case '\r':
sb.Append("\\r"); break;
case '\t':
sb.Append("\\t"); break;
default:
sb.Append(cStr); break;
}
}
return sb.ToString();
}
标签：jsonString,return,string,C#,json,sb,dt,DbDataReader,Append 来源： https://www.cnblogs.com/sunliyuan/p/11398654.html