json的调用

WebService

    [WebMethod]

    public string GetCategory()
    {
        SqlConnection conn = new SqlConnection("server=.;database=Holpe_Info;uid=sa;pwd=123;");

        DataTable dt = new DataTable();

        dt.TableName = "t_Category";

        SqlDataAdapter sda = new SqlDataAdapter("SELECT Category_Name FROM Item_T_Info_Category WHERE Category_ParentID=1", conn);

        sda.Fill(dt);

        string str = DataTable2Json(dt);

        return str;
    }

    private string DataTable2Json(DataTable dt)
    {
        StringBuilder jsonBuilder = new StringBuilder();

        jsonBuilder.Append("{/"");

        jsonBuilder.Append(dt.TableName);

        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();
    }

HTML

<pre class="html" name="code"><script type="text/javascript">

$(function(){
    
    $("#button1").click(function(){
        
        $.ajax({
            
        type: "Post",
            
        dataType: "json",
            
        contentType:"application/json;utf-8",
            
        url: "WS1.asmx/GetCategory",
            
        data:"{}",
            
        success: function(data){
            //json
            //var jsontext = '{"man":{"weight":"75kg","age":"24"},"ar":["1","2","3","4"]}';
            
            //解析json
            var aman = eval("("+data.d+")");
            
            //取出json中的信息
            for(var i=0;i<aman.t_Category.length;i++)
            {
                alert(aman.t_Category[i].Category_Name);
            }
        }
        });
    })
})
</script></pre>