多个过滤器不起作用 [英] multiple filters not working

问题描述

 私有  void  button1_Click(如果(ch1.Checked& ch2.Checked& ch3.Checked)
            {
                字符串过滤器= 字符串 .Format("  ACCentrala = \'" +(centrala.Text +   \'"));
                过滤器+ = " ;
                过滤器+ = 字符串 .Format("  +(lokal.Text +   \'"))；
                过滤器+ = " ;
                过滤器+ = 字符串 .Format("  +(ploca.Text +   \'"))；
                此 .istorijaBS.Filter =过滤器；
            }
        } 

我需要上面代码的帮助，我有三个文本框text1，text2和text3，三个复选框check1，check2和check3.当CHECK1检查text1为有源滤波器...等等.但是在这段代码中，当我检查所有3个文本框以进行全部3个文本框过滤时，它不起作用吗? "code-keyword">字符串 filter1 = 字符串 .Format(" ACCentrala = \"{0} \""，centrala.Text)； 字符串 filter2 = 字符串 .Format(" ACTelefon = \"{0} \""，lokal.Text)； 字符串 filter3 = 字符串 .Format(" ACPloca = \"{0} \""，ploca.Text)； 字符串 filter = " ; 如果(已选中ch1) { filter = filter1; } 如果(已选中ch2) { 如果(！string.IsNullOrEmpty(filter)) { 过滤器+ = " ; } 过滤器+ = filter2; } 如果(ch3.已选中) { 如果(！string.IsNullOrEmpty(filter)) { 过滤器+ = " ; } 过滤器+ = filter3; } 此 .istorijaBS.Filter =过滤器；

private void button1_Click(object sender, EventArgs e)
        {

            if (ch1.Checked && ch2.Checked && ch3.Checked)
            {
                string filter = string.Format("ACCentrala = \'" + (centrala.Text + "\'"));
                filter += " AND ";
                filter += string.Format("ACTelefon = \'" + (lokal.Text + "\'"));
                filter += " AND ";
                filter += string.Format("ACPloca = \'" + (ploca.Text + "\'"));
                this.istorijaBS.Filter = filter;
            }
        }

I need help with code above, I have three textboxes text1, text2 and text3, 3 checkboxes check1, check2 and check3. when check1 is checked text1 is active filter...and so on. but in this code when I check all 3 of them for filtering with all 3 textboxes it doesnt work?

解决方案

string filter1 = string.Format("ACCentrala = \"{0}\"", centrala.Text);
string filter2 = string.Format("ACTelefon = \"{0}\"", lokal.Text);
string filter3 = string.Format("ACPloca = \"{0}\"", ploca.Text);

string filter = "";

if (ch1.Checked)
{
    filter = filter1;
}
if (ch2.Checked)
{
    if (!string.IsNullOrEmpty(filter))
    {
        filter += " AND ";
    }
    filter += filter2;
}
if (ch3.Checked)
{
    if (!string.IsNullOrEmpty(filter))
    {
        filter += " AND ";
    }
    filter += filter3;
}
this.istorijaBS.Filter = filter;

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