C# DataTable和string相互转换

DataTable到string　　　

/// <summary>
/// DataTable 到 string
/// </summary>
/// <param name="dt"></param>
/// <returns></returns>
public static string DataTableToString(DataTable dt)
{
//!@&,#$%,^&*为字段的拼接字符串
//为了防止连接字符串不在DataTable数据中存在，特意将拼接字符串写成特殊的字符！
StringBuilder strData = new StringBuilder();
StringWriter sw = new StringWriter();

//DataTable 的当前数据结构以 XML 架构形式写入指定的流
dt.WriteXmlSchema(sw);
strData.Append(sw.ToString());
sw.Close();
strData.Append("@&@");
for (int i = 0; i < dt.Rows.Count; i++) //遍历dt的行
{
DataRow row = dt.Rows[i];
if (i > 0) //从第二行数据开始，加上行的连接字符串
{
strData.Append("#$%");
}
for (int j = 0; j < dt.Columns.Count; j++) //遍历row的列
{
if (j > 0) //从第二个字段开始，加上字段的连接字符串
{
strData.Append("^&*");
}
strData.Append(Convert.ToString(row[j])); //取数据
}
}

return strData.ToString();
}

string到[b]DataTable[/b]

/// <summary>
/// string 到 DataTable
/// </summary>
/// <param name="strdata"></param>
/// <returns></returns>
public static DataTable StringToDataTable(string strdata)
{
if (string.IsNullOrEmpty(strdata))
{
return null;
}
DataTable dt = new DataTable();
string[] strSplit = { "@&@" };
string[] strRow = { "#$%" }; //分解行的字符串
string[] strColumn = { "^&*" }; //分解字段的字符串

string[] strArr = strdata.Split(strSplit, StringSplitOptions.None);
StringReader sr = new StringReader(strArr[0]);
dt.ReadXmlSchema(sr);
sr.Close();

string strTable = strArr[1]; //取表的数据
if (!string.IsNullOrEmpty(strTable))
{
string[] strRows = strTable.Split(strRow, StringSplitOptions.None); //解析成行的字符串数组
for (int rowIndex = 0; rowIndex < strRows.Length; rowIndex++) //行的字符串数组遍历
{
string vsRow = strRows[rowIndex]; //取行的字符串
string[] vsColumns = vsRow.Split(strColumn, StringSplitOptions.None); //解析成字段数组
dt.Rows.Add(vsColumns);
}
}
return dt;
}