StringBuilder方法的全部代码：
using System;
using System.Text;
using System.Data;
public partial class Default2 : System.Web.UI.Page
{
private string sasss;
protected void Page_Load(object sender, EventArgs e)
{
DataTable table = getData();
sasss = DataTableToJson(table);
Response.Write(sasss + "<br/>");
}
public string DataTableToJson(DataTable table)
{
var JsonString = new StringBuilder();
if (table.Rows.Count > 0)
{
JsonString.Append("[");
for (int i = 0; i < table.Rows.Count; i++)
{
JsonString.Append("{");
for (int j = 0; j < table.Columns.Count; j++)
{
if (j < table.Columns.Count - 1)
{
JsonString.Append("\"" + table.Columns[j].ColumnName.ToString() + "\":" + "\"" + table.Rows[i][j].ToString() + "\",");
}
else if (j == table.Columns.Count - 1)
{
JsonString.Append("\"" + table.Columns[j].ColumnName.ToString() + "\":" + "\"" + table.Rows[i][j].ToString() + "\"");
}
}
if (i == table.Rows.Count - 1)
{
JsonString.Append("}");
}
else
{
JsonString.Append("},");
}
}
JsonString.Append("]");
}
return JsonString.ToString();
}
private DataTable getData()
{
DataTable dt = new DataTable();
dt.Columns.Add("编号", typeof(Int32));
dt.Columns.Add("姓名", typeof(string));
dt.Columns.Add("性别", typeof(string));
dt.Columns.Add("学历", typeof(string));
dt.Rows.Add(1, "王超", "男", "本科");
dt.Rows.Add(2, "周丽", "女", "专科");
dt.Rows.Add(3, "李娟", "女", "专科");
dt.Rows.Add(4, "杨明", "男", "硕士");
dt.Rows.Add(5, "张德", "男", "本科");
return dt;
}
}
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