DataTable或DataSet与JSON互转

通过AJAX异步减少网络内容传输，而JSON则可以把传输内容缩减到纯数据；然后利用jQuery内置的AJAX功能直接获得JSON格式的数据；在客户端直接绑定到数据控件里面，从而达到最优。

#region dataTable转换成Json格式
/// <summary>
/// dataTable转换成Json格式
/// </summary>
/// <param name="dt"></param>
/// <returns></returns>
public static string DataTable2Json(DataTable dt)
{
StringBuilder jsonBuilder = new StringBuilder();
jsonBuilder.Append("{\"");
jsonBuilder.Append(dt.TableName.ToString());
jsonBuilder.Append("\":[");
for (int i = 0; i < dt.Rows.Count; i++)
{
jsonBuilder.Append("{");
for (int j = 0; j < dt.Columns.Count; j++)
{
jsonBuilder.Append("\"");
jsonBuilder.Append(dt.Columns[j].ColumnName);
jsonBuilder.Append("\":\"");
jsonBuilder.Append(dt.Rows[i][j].ToString());
jsonBuilder.Append("\",");
}
jsonBuilder.Remove(jsonBuilder.Length - 1, 1);
jsonBuilder.Append("},");
}
jsonBuilder.Remove(jsonBuilder.Length - 1, 1);
jsonBuilder.Append("]");
jsonBuilder.Append("}");
return jsonBuilder.ToString();
}

#endregion dataTable转换成Json格式

#region DataSet转换成Json格式
/// <summary>
/// DataSet转换成Json格式
/// </summary>
/// <param name="ds">DataSet</param>
/// <returns></returns>
public static string Dataset2Json(DataSet ds)
{
StringBuilder json = new StringBuilder();

foreach (DataTable dt in ds.Tables)
{
json.Append("{\"");
json.Append(dt.TableName);
json.Append("\":");
json.Append(DataTable2Json(dt));
json.Append("}");
}
return json.ToString();
}
#endregion

public class ConventDataTableToJson

{

/// <summary>

/// 序列化方法（带分页）
/// </summary>

/// <param name="dt"></param>

/// <returns></returns>
public static string Serialize(DataTable dt)

{

List<Dictionary<string, object>> list = new List<Dictionary<string, object>>();

foreach (DataRow dr in dt.Rows)

{

Dictionary<string, object> result = new Dictionary<string, object>();

foreach (DataColumn dc in dt.Columns)

{

result.Add(dc.ColumnName, dr[dc].ToString());

}

list.Add(result);

}

int count = 0;

try

{

count = Convert.ToInt32(dt.TableName);

}

catch (System.Exception ex)

{

count = dt.Rows.Count;

}

string strReturn = "";

if (count == 0)

{

strReturn = "{\"totalCount\":0,\"data\":[]}";

}

else

{

strReturn = ConventToJson(list, count);

}

return strReturn;

}

/// <summary>

/// 转换为JSON对象
/// </summary>

/// <returns></returns>

public static string ConventToJson<T>(List<T> list, int count)

{

JavaScriptSerializer serializer = new JavaScriptSerializer();

string strJson = serializer.Serialize(list);

strJson = strJson.Substring(1);

strJson = strJson.Insert(0, "{totalCount:" + count + ",data:[");

strJson += "}";

return strJson;

}

/// <summary>

/// 不需要分页
/// </summary>

/// <param name="dt"></param>

/// <param name="flag">false</param>

/// <returns></returns>

public static string Serialize(DataTable dt,bool flag)

{

JavaScriptSerializer serializer = new JavaScriptSerializer();

List<Dictionary<string, object>> list = new List<Dictionary<string, object>>();

foreach (DataRow dr in dt.Rows)

{

Dictionary<string, object> result = new Dictionary<string, object>();

foreach (DataColumn dc in dt.Columns)

{

result.Add(dc.ColumnName, dr[dc].ToString());

}

list.Add(result);

}

return serializer.Serialize(list); ;

}

}