[英]How can I use a method's (whose argument has been passed by ref) return value in Main()
[英]How can I pass a variables name, not its value. Then use its value after it has been passed?
我想将这些字符串传递到循环中,我希望将变量列表 splitSearchString[i] 作为变量本身而不是它的值传递。 一旦在循环中,我想使用它的值。 这是可能的还是我以错误的方式解决这个问题? 感谢您帮助新手。 这是代码:
string[] splitSearchString = SearchText.Split(' ');
int i = 0;
switch (SearchBy)
{
case 1:
SearchByString = "cert_code LIKE '%" + splitSearchString[i] + "%'";
break;
case 2:
SearchByString = "upc LIKE '%" + splitSearchString[i] + "%'";
break;
case 3:
SearchByString = "description LIKE '%" + splitSearchString[i] + "%'";
break;
case 4:
SearchByString = "(cert_code LIKE '%" + splitSearchString[i] + "%' OR upc LIKE '%" + splitSearchString[i] + "%')";
break;
case 5:
SearchByString = "(cert_code LIKE '%" + splitSearchString[i] + "%' OR description LIKE '%" + splitSearchString[i] + "%')";
break;
case 6:
SearchByString = "(upc LIKE '%" + splitSearchString[i] + "%' OR description LIKE '%" + splitSearchString[i] + "%')";
break;
default:
SearchByString = "(upc LIKE '%" + splitSearchString[i] + "%' OR description LIKE '%" + splitSearchString[i] + "%' OR cert_code LIKE '%" + splitSearchString[i] + "%')";
break;
}
SqlConnection sqlConn = new SqlConnection(connectionString);
sqlConn.Open();
SqlCommand sqlCmd;
if (searchString.Contains(' ') == true && SearchExact == false)
{
formatedSplitSearchString = "SELECT CASE WHEN t1.longdesc IS NULL OR t1.longdesc = '' THEN t1.desc WHEN t1.longdesc IS NOT NULL AND t1.longdesc <> '' THEN t1.longdesc END AS 'description', t1.upcode FROM Product t1 LEFT JOIN Vendor t2 ON t1.vendor = t2.vendor_no LEFT JOIN Department t3 ON t1.department = t3.dept_no LEFT JOIN Section t4 on t1.section = t4.section WHERE " + SearchByString + VendorFilterStr + DeptFilterStr + SectionFilterStr;
for (i = 0; i < splitSearchString.Length; i++)
{
if (i > 0)
{
formatedSplitSearchString += " AND " + SearchByString;
}
}
formatedSplitSearchString += VendorFilterStr + DeptFilterStr + SectionFilterStr + ";";
sqlCmd = new SqlCommand(formatedSplitSearchString, sqlConn);
}
else
{
sqlCmd = new SqlCommand(
"SELECT CASE WHEN t1.longdesc IS NULL OR t1.longdesc = '' THEN t1.description WHEN t1.longdesc IS NOT NULL AND t1.longdesc <> '' THEN t1.longdesc END AS 'description', t1.upcode FROM Product t1 LEFT JOIN Vendor t2 ON t1.vendor = t2.vendor_no LEFT JOIN Sections t4 on t1.section = t4.section LEFT JOIN Departments t3 ON t1.department = t3.dept_no WHERE " + SearchByString + VendorFilterStr + DeptFilterStr + SectionFilterStr + ";", sqlConn);
}
}
SqlDataReader sqlDr = sqlCmd.ExecuteReader();
while (sqlDr.Read())
{
lvi = new ListViewItem((sqlDr["description"].ToString()));
lvi.SubItems.Add(sqlDr["upc"].ToString());
lviList.Add(lvi);
}
return lviList;
所以,你想要做的是通过引用传递变量,这样你就传递了变量的实际内存地址。
更好的选择是创建一个返回数组的函数,并调用该函数来设置数组。
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