C# 如何设置所有数据'；它在文本框中

首先是一个搜索框表单和一个视图表单。在searchbox中传递id值后，它应该返回在textchange方法发生后与该人员id匹配的所有值。但它不会在文本框上显示一个值。这是我的密码

 public void first_tab_search(string key)
        {
            key = txtSearch.Text;
            var first = from a in dbcon.personal_informations where a.last_name == key select a;
            foreach (var setThem in first)
            {
                txtsurname.Text = setThem.last_name;
                txtfirstname.Text = setThem.first_name;
                txtmiddlename.Text = setThem.middle_name;
                txtID.Text = setThem.userid;
                txtweight.Text = setThem.weight;
                txttin.Text = setThem.tin;
                txtsss.Text = setThem.sss;
                txtaeno.Text = setThem.agency_employee_no;
                txtbloodtype.Text = setThem.blood_type;
                txtcitizenship.Text = setThem.citizenship;
                txtcivilstatus.Text = setThem.civil_status;
                txtcpno.Text = setThem.cell_no;
                txtdob.Text = setThem.datetime_of_birth.ToString();
                txtemail.Text = setThem.email_address;
                txtgender.Text = setThem.sex;
                txtgsis.Text = setThem.gsis_id;
                txtheight.Text = setThem.height;
                txtnameext.Text = setThem.name_ext;
                txtpagibig.Text = setThem.pagibig_id;
                txtpermaaddr.Text = setThem.permanent_address;
                txtpermatelno.Text = setThem.permanent_telno;
                txtpermazip.Text = setThem.permanent_zipcode;
                txtphilhealth.Text = setThem.philhealth;
                txtpob.Text = setThem.place_of_birth;
                txtresidentialaddr.Text = setThem.residential_address;
                txtresitelno.Text = setThem.residential_telno;
                txtresizip.Text = setThem.residential_zipcode;
                txtweight.Text = setThem.weight;
            }
        }

---

你这里有很多问题

将一个键传递给该方法，然后立即用搜索框的内容覆盖它

您的搜索可能会返回多个结果，因此您的代码会在每个结果中循环，并用最后返回的行覆盖输出值。在循环中使用+=而不是+，即

txtLastname.Text+=setThem.last_name

您的代码当前区分大小写，这可能是理想的方法，但可能不是

---

您是否尝试先调试它并查看

中的值？顺便问一下，在循环中每次设置相同的文本框有什么意义？