C中文1，系统繁忙

C#代码新增部门：

            //创建部门
            McAddDepartment McCreateDepartment = new McAddDepartment();
            McCreateDepartment.access_token = this._McAccess_Token.access_token;
            McCreateDepartment.name = "管理部";
            McCreateDepartment.parentid = "2";
            McCreateDepartment.order = "3";
            McAddDepartmentResult McCreateDepartmentResult = null;
            url = "https://oapi.dingtalk.com/department/create?access_token=" + this._McAccess_Token.access_token;
            sql = McDataSetSerialize.GetJson<McAddDepartment>(McCreateDepartment);
            sql = this._DataAccess.PostUrltoHtml(url, sql, "UTF-8", "application/json");
            McCreateDepartmentResult = McDataSetSerialize.ParseFormJson<McAddDepartmentResult>(sql);
            this.tbxresult.Text = sql;
sql的返回值：-1，系统繁忙。“管理部”改成字母就提示成功了。说来惭愧，只要用中文，不管是部门，还是用户成员，都是“-1，系统繁忙”，换成字母就OK了。
请大家帮助一下。谢谢！