Question

BindingSource bs = new BindingSource();
bs.DataSource = dataGridViewShowPeople.DataSource;
bs.Filter = " Convert(ID, 'System.String') like '" + textBoxId.Text + "%' AND  Convert(lastName, 'System.String') like '%" + textBoxLastName.Text + "%' AND Convert(firstName, 'System.String') like '" + textBoxFirstName.Text + "%' AND Convert(address, 'System.String') like '" + textBoxAddress.Text + "%'";             
dataGridViewShowPeople.DataSource = bs;

Answer 1

您的一个或多个文本框中可能只有一个引号。这可能会破坏字符串连接逻辑并混淆尝试应用Filter属性的代码您需要调用string.Replace方法将文本框值中的每个引号char加倍，如MSDN中DataColumn.Expression属性

中所述

用户定义的值可以在要与之比较的表达式中使用列值。字符串值应该包含在单个值中引号（以及字符串值中的每个单引号字符必须通过在另一个单引号前加上它来逃避字符）即可。 .....

但是我发现对CONVERT函数的调用很可疑，至少对于字段firstName，lastName和address。它们很可能已经是数据库端的字符串，因此无需调用CONVERT函数

string ID = textBoxId.Text.Replace("'", "''");
string last = textBoxLastName.Text.Replace("'","''");
string first = textBoxFirstName.Text.Replace("'", "''");
string address = textBoxAddress.Text.Replace("'", "''");
BindingSource bs = new BindingSource();
bs.DataSource = dataGridViewShowPeople.DataSource;
bs.Filter = string.Format("Convert(ID, 'System.String') like '{0}%' AND " + 
                          "lastName like '%{1}%' AND firstName like '{2}%' AND " + 
                          "address like '{2}%'", ID, last, first, address);

Answer 2

bs.Filter = " Convert(ID, 'System.String') like '%" + textBoxId.Text + "%' AND  Convert(lastName, 'System.String') like '%" + textBoxLastName.Text + "%' AND Convert(firstName, 'System.String') like '%" + textBoxFirstName.Text + "%' AND Convert(address, 'System.String') like '%" + textBoxAddress.Text + "%'";

你在某些地方错过了%

当我按地址过滤时，我收到此错误：语法错误：''运算符后缺少操作数

2 个答案: