1using CrystalDecisions.Shared;
2using CrystalDecisions.CrystalReports.Engine;
3using CrystalDecisions.Windows.Forms;

 1private void button1_Click(object sender, EventArgs e)
 2        {
 3
 4            
 5            String cnstr = "";
 6            //保持字段的字符串 
 7            String fldstr = "";
 8            //保持字段名称的数组 
 9            String[] fldArr=new string[6] ;
10            int i = 0;
11            int j = 0;
12             
13            
14
15            //--------------------------------------------------------------------- 
16            //获取选取的字段并进行处理 
17            if (checkBox1.Checked == true)
18                fldstr = fldstr + "," + checkBox1.Text;
19            if (checkBox2.Checked == true)
20                fldstr = fldstr + "," + checkBox2.Text;
21            if (checkBox3.Checked == true)
22                fldstr = fldstr + "," + checkBox3.Text;
23            if (checkBox4.Checked == true)
24                fldstr = fldstr + "," + checkBox4.Text;
25            if (checkBox5.Checked == true)
26                fldstr = fldstr + "," + checkBox5.Text;
27            if (checkBox6.Checked == true)
28                fldstr = fldstr + "," + checkBox6.Text;
29
30            if (fldstr == "") {
31                MessageBox.Show("请选择要显示的字段");
32                return;
33            }
34
35            if (fldstr.Substring(0, 1) == ",") 
36                fldstr = fldstr.Substring(1, fldstr.Length - 1);
37
38            fldArr = fldstr.Split(new Char[] {','});
39
40             cnstr= "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" + Application.StartupPath + "\\BBT_Crystal.mdb" ;
41            OleDbConnection cn=new OleDbConnection(cnstr);
42            cn.Open();
43
44            string sql="";
45            sql=" Select " + fldstr + " From 材料采购明细" ;
46
47            OleDbDataAdapter da1=new OleDbDataAdapter(sql,cn);
48
49            DataSet ds1=new DataSet();
50            da1.Fill(ds1, "材料采购明细");
51 
52
53            CrystalReport1 crReportDocument=new CrystalReport1();
54
55
56            for(i=0;i<fldArr.Length;i++)
57            {
58            
59               // 将公式绑定到具体字段 
60                crReportDocument.DataDefinition.FormulaFields["mf" + (i + 1).ToString()].Text = "{材料采购明细." + fldArr[i] +"}" ;
61                crReportDocument.DataDefinition.FormulaFields["mt" + (i + 1).ToString()].Text = "\"" + fldArr[i] + "\"";
62            }
63
64            for (j =i+ 1; j <= 6; j++)
65            {
66                crReportDocument.DataDefinition.FormulaFields["mt" + (j).ToString()].Text = "";
67            }
68
69            crReportDocument.SetDataSource(ds1);
70            crystalReportViewer1.ReportSource=crReportDocument;          
71
72        }