1 public class ObjectToJson
2 {
3 /// <summary>
4 /// List转成json
5 /// </summary>
6 /// <typeparam name="T"></typeparam>
7 /// <param name="jsonName"></param>
8 /// <param name="list"></param>
9 /// <returns></returns>
10 public static string ListToJson<T>(IList<T> list, string jsonName)
11 {
12 StringBuilder Json = new StringBuilder();
13 if (string.IsNullOrEmpty(jsonName))
14 jsonName = list[0].GetType().Name;
15 Json.Append("{\"" + jsonName + "\":[");
16 if (list.Count > 0)
17 {
18 for (int i = 0; i < list.Count; i++)
19 {
20 T obj = Activator.CreateInstance<T>();
21 PropertyInfo[] pi = obj.GetType().GetProperties();
22 Json.Append("{");
23 for (int j = 0; j < pi.Length; j++)
24 {
25 Type type = pi[j].GetValue(list[i], null).GetType();
26 Json.Append("\"" + pi[j].Name.ToString() + "\":" + StringFormat(pi[j].GetValue(list[i], null).ToString(), type));
27
28 if (j < pi.Length - 1)
29 {
30 Json.Append(",");
31 }
32 }
33 Json.Append("}");
34 if (i < list.Count - 1)
35 {
36 Json.Append(",");
37 }
38 }
39 }
40 Json.Append("]}");
41 return Json.ToString();
42 }
43
44 /// <summary>
45 /// List转成json
46 /// </summary>
47 /// <typeparam name="T"></typeparam>
48 /// <param name="list"></param>
49 /// <returns></returns>
50 public static string ListToJson<T>(IList<T> list)
51 {
52 object obj = list[0];
53 return ListToJson<T>(list, obj.GetType().Name);
54 }
55
56 /// <summary>
57 /// 对象转换为Json字符串
58 /// </summary>
59 /// <param name="jsonObject">对象</param>
60 /// <returns>Json字符串</returns>
61 public static string ToJson(object jsonObject)
62 {
63 string jsonString = "{";
64 PropertyInfo[] propertyInfo = jsonObject.GetType().GetProperties();
65 for (int i = 0; i < propertyInfo.Length; i++)
66 {
67 object objectValue = propertyInfo[i].GetGetMethod().Invoke(jsonObject, null);
68 string value = string.Empty;
69 if (objectValue is DateTime || objectValue is Guid || objectValue is TimeSpan)
70 {
71 value = "'" + objectValue.ToString() + "'";
72 }
73 else if (objectValue is string)
74 {
75 value = "'" + ToJson(objectValue.ToString()) + "'";
76 }
77 else if (objectValue is IEnumerable)
78 {
79 value = ToJson((IEnumerable)objectValue);
80 }
81 else
82 {
83 value = ToJson(objectValue.ToString());
84 }
85 jsonString += "\"" + ToJson(propertyInfo[i].Name) + "\":" + value + ",";
86 }
87 jsonString.Remove(jsonString.Length - 1, jsonString.Length);
88 return jsonString + "}";
89 }
90
91 /// <summary>
92 /// 对象集合转换Json
93 /// </summary>
94 /// <param name="array">集合对象</param>
95 /// <returns>Json字符串</returns>
96 public static string ToJson(IEnumerable array)
97 {
98 string jsonString = "[";
99 foreach (object item in array)
100 {
101 jsonString += ToJson(item) + ",";
102 }
103 jsonString.Remove(jsonString.Length - 1, jsonString.Length);
104 return jsonString + "]";
105 }
106
107 /// <summary>
108 /// 普通集合转换Json
109 /// </summary>
110 /// <param name="array">集合对象</param>
111 /// <returns>Json字符串</returns>
112 public static string ToArrayString(IEnumerable array)
113 {
114 string jsonString = "[";
115 foreach (object item in array)
116 {
117 jsonString = ToJson(item.ToString()) + ",";
118 }
119 jsonString.Remove(jsonString.Length - 1, jsonString.Length);
120 return jsonString + "]";
121 }
122
123 /// <summary>
124 /// Datatable转换为Json
125 /// </summary>
126 /// <param name="table">Datatable对象</param>
127 /// <returns>Json字符串</returns>
128 public static string ToJson(DataTable dt)
129 {
130 StringBuilder jsonString = new StringBuilder();
131 jsonString.Append("[");
132 DataRowCollection drc = dt.Rows;
133 for (int i = 0; i < drc.Count; i++)
134 {
135 jsonString.Append("{");
136 for (int j = 0; j < dt.Columns.Count; j++)
137 {
138 string strKey = dt.Columns[j].ColumnName;
139 string strValue = drc[i][j].ToString();
140 Type type = dt.Columns[j].DataType;
141 jsonString.Append("\"" + strKey + "\":");
142 strValue = StringFormat(strValue, type);
143 if (j < dt.Columns.Count - 1)
144 {
145 jsonString.Append(strValue + ",");
146 }
147 else
148 {
149 jsonString.Append(strValue);
150 }
151 }
152 jsonString.Append("},");
153 }
154 jsonString.Remove(jsonString.Length - 1, 1);
155 jsonString.Append("]");
156 return jsonString.ToString();
157 }
158
159 /// <summary>
160 /// DataTable转成Json
161 /// </summary>
162 /// <param name="jsonName"></param>
163 /// <param name="dt"></param>
164 /// <returns></returns>
165 public static string ToJson(DataTable dt, string jsonName)
166 {
167 StringBuilder Json = new StringBuilder();
168 if (string.IsNullOrEmpty(jsonName))
169 jsonName = dt.TableName;
170 Json.Append("{\"" + jsonName + "\":[");
171 if (dt.Rows.Count > 0)
172 {
173 for (int i = 0; i < dt.Rows.Count; i++)
174 {
175 Json.Append("{");
176 for (int j = 0; j < dt.Columns.Count; j++)
177 {
178 Type type = dt.Rows[i][j].GetType();
179 Json.Append("\"" + dt.Columns[j].ColumnName.ToString() + "\":" + StringFormat(dt.Rows[i][j].ToString(), type));
180 if (j < dt.Columns.Count - 1)
181 {
182 Json.Append(",");
183 }
184 }
185 Json.Append("}");
186 if (i < dt.Rows.Count - 1)
187 {
188 Json.Append(",");
189 }
190 }
191 }
192 Json.Append("]}");
193 return Json.ToString();
194 }
195
196 /// <summary>
197 /// DataReader转换为Json
198 /// </summary>
199 /// <param name="dataReader">DataReader对象</param>
200 /// <returns>Json字符串</returns>
201 public static string ToJson(DbDataReader dataReader)
202 {
203 StringBuilder jsonString = new StringBuilder();
204 jsonString.Append("[");
205 while (dataReader.Read())
206 {
207 jsonString.Append("{");
208 for (int i = 0; i < dataReader.FieldCount; i++)
209 {
210 Type type = dataReader.GetFieldType(i);
211 string strKey = dataReader.GetName(i);
212 string strValue = dataReader[i].ToString();
213 jsonString.Append("\"" + strKey + "\":");
214 strValue = StringFormat(strValue, type);
215 if (i < dataReader.FieldCount - 1)
216 {
217 jsonString.Append(strValue + ",");
218 }
219 else
220 {
221 jsonString.Append(strValue);
222 }
223 }
224 jsonString.Append("},");
225 }
226 dataReader.Close();
227 jsonString.Remove(jsonString.Length - 1, 1);
228 jsonString.Append("]");
229 return jsonString.ToString();
230 }
231
232 /// <summary>
233 /// DataSet转换为Json
234 /// </summary>
235 /// <param name="dataSet">DataSet对象</param>
236 /// <returns>Json字符串</returns>
237 public static string ToJson(DataSet dataSet)
238 {
239 string jsonString = "{";
240 foreach (DataTable table in dataSet.Tables)
241 {
242 jsonString += "\"" + table.TableName + "\":" + ToJson(table) + ",";
243 }
244 jsonString = jsonString.TrimEnd(',');
245 return jsonString + "}";
246 }
247
248 /// <summary>
249 /// 过滤特殊字符
250 /// </summary>
251 /// <param name="s"></param>
252 /// <returns></returns>
253 private static string String2Json(String s)
254 {
255 StringBuilder sb = new StringBuilder();
256 for (int i = 0; i < s.Length; i++)
257 {
258 char c = s.ToCharArray()[i];
259 switch (c)
260 {
261 case '\"':
262 sb.Append("\\\""); break;
263 case '\\':
264 sb.Append("\\\\"); break;
265 case '/':
266 sb.Append("\\/"); break;
267 case '\b':
268 sb.Append("\\b"); break;
269 case '\f':
270 sb.Append("\\f"); break;
271 case '\n':
272 sb.Append("\\n"); break;
273 case '\r':
274 sb.Append("\\r"); break;
275 case '\t':
276 sb.Append("\\t"); break;
277 default:
278 sb.Append(c); break;
279 }
280 }
281 return sb.ToString();
282 }
283
284 /// <summary>
285 /// 格式化字符型、日期型、布尔型
286 /// </summary>
287 /// <param name="str"></param>
288 /// <param name="type"></param>
289 /// <returns></returns>
290 private static string StringFormat(string str, Type type)
291 {
292 if (type == typeof(string))
293 {
294 str = String2Json(str);
295 str = "\"" + str + "\"";
296 }
297 else if (type == typeof(DateTime))
298 {
299 str = "\"" + str + "\"";
300 }
301 else if (type == typeof(bool))
302 {
303 str = str.ToLower();
304 }
305 return str;
306 }
307 }
标签：jsonString,string,C#,Json,JSON,ToString,格式,dt,Append From： https://www.cnblogs.com/lgx5/p/18305477