Operator 'and' incompatible with operand types 'Boolean' and 'String'

Question

Operator 'and' incompatible with operand types 'Boolean' and 'String'

Answer 1

googlec 翻译一下就知道了

Answer 2

如果你写了这样的代码就会收到这个错误：
bool b = false;
string s = "hello world";
if (b && s)
{
   ...
}

Answer 3

哦。有点多。
 List<string> codelist;
                                               codelist = GetParentCode_DiShi(cmbxUnits.SelectedValue.ToString());
                       (cmbxUnits.SelectedValue.ToString()).ToString());
                        string str = string.Empty;
                                               if (codelist.Count>0)
                        {   
                            if (codelist.Count == 1)
                            {
                                str= codelist[0];
                            }
                            else
                            {
                                for (int i = 0; i <= codelist.ToArray().Length - 1; i++)
                                   str = str+ codelist[i] + ",";
                            }
                        }                        cnd.Append(" and UnitCode in('@" + (index++).ToString() + "')");
                        pars.Add(str);
 DataBind(this.cmbxUnits.Text.Trim(), cnd.ToString(), pars.ToArray());
            this.txtSelCondition.Text = string.Empty;
绑定方法：  public void DataBind(string unitName, string strCond, object[] paras)
        {
                       frmWait.WaitProcess(this, () =>
            {
                using (BModel.Session Session = new Dx.HRJMIS.BModel.Session(false))
                {
                    var personinfo = Common.Employee.GetCurrentEmployeeList(unitName, orderby, strCond, paras);
                    datasource = new BindingCollection<xEmployee>();//修改
                    foreach (xEmployee p in personinfo)
                    {
                        datasource.Add(p);
                    };
                    dataGridView1.DataSource = datasource;
                }
            });
        }
  public static IQueryable GetCurrentEmployeeList(string unitName, string orderBy, string condition, params object[] para)
        {
                       var employeeInner = BModel.View_Person.Find<BModel.View_Person>(orderBy, condition, para);
            var unitList = unitName.Length > 0 ? BModel.Units.Find<BModel.Units>(null, "Name.Contains(@0)", unitName) : BModel.Units.Find<BModel.Units>(null, "1=1", null);
            var employeeinfo = from a in employeeInner
                               join u in unitList on a.UnitCode equals u.Code

Answer 4

DataBind(this.cmbxUnits.Text.Trim(), cnd.ToString(), pars.ToArray());
var personinfo = Common.Employee.GetCurrentEmployeeList(unitName, orderby, strCond, paras);
var employeeInner = BModel.View_Person.Find<BModel.View_Person>(orderBy, condition, para);
只能对 Type.IsGenericParameter 为 True 的类型调用方法。

Answer 5

DataBind(this.cmbxUnits.Text.Trim(), cnd.ToString(), pars.ToArray());
var personinfo = Common.Employee.GetCurrentEmployeeList(unitName, orderby, strCond, paras);
var employeeInner = BModel.View_Person.Find<BModel.View_Person>(orderBy, condition, para);
只能对 Type.IsGenericParameter 为 True 的类型调用方法。