动态水晶报告紧急帮助 [英] Dynamic crystal reporting urgent Help

问题描述

我想在textbox1中编写我的sql代码，在button1的click事件上我应该得到写入的sql代码的报告，这样做我得到一个错误无法转换类型的对象'CrystalDecisions.CrystalReports.Engine.FieldObject '输入'CrystalDecisions.CrystalReports.Engine.TextObject'。我在这行上得到了这个错误MyText =（（TextObject）objRpt.ReportDefinition.ReportObjects [i + 1]）;



这里是我的代码：

i want to write my sql code in textbox1 and on click event of button1 i should get the report of the written sql code while doing this i get an error "Unable to cast object of type 'CrystalDecisions.CrystalReports.Engine.FieldObject' to type 'CrystalDecisions.CrystalReports.Engine.TextObject'." i get this error on this line " MyText = ((TextObject)objRpt.ReportDefinition.ReportObjects[i + 1]);"

here is my code:

CrystalReport1 objRpt = new CrystalReport1();
       public Form1()
       {
           InitializeComponent();
       }
       private void button1_Click(object sender, System.EventArgs e)
       {
           SqlConnection cnn;
           string connectionString = null;
           string sql = null;
           connectionString = "data source=Abc-pc;initial catalog=ICB;Integrated Security = true;";
           cnn = new SqlConnection(connectionString);
           cnn.Open();
           sql = procesSQL();
           SqlDataAdapter dscmd = new SqlDataAdapter(sql, cnn);
           PremiumPolicyDataSet ds = new PremiumPolicyDataSet();
           dscmd.Fill(ds, "EMP_INFO");
           objRpt.SetDataSource(ds.Tables[1]);
           crystalReportViewer1.ReportSource = objRpt;
           crystalReportViewer1.Refresh();
       }
       public string procesSQL()
       {
           string sql = null;
           string inSql = null;
           string firstPart = null;
           string lastPart = null;
           int selectStart = 0;
           int fromStart = 0;
           string[] fields = null;
           string[] sep = { "," };
           int i = 0;
           TextObject MyText;
           inSql = textBox1.Text;
           inSql = inSql.ToUpper();
           selectStart = inSql.IndexOf("SELECT");
           fromStart = inSql.IndexOf("FROM");
           selectStart = selectStart + 6;
           firstPart = inSql.Substring(selectStart, (fromStart - selectStart));
           lastPart = inSql.Substring(fromStart, inSql.Length - fromStart);
           fields = firstPart.Split(',');
           firstPart = "";
           for (i = 0; i <= fields.Length - 1; i++)
           {
               if (i > 0)
               {
                   firstPart = firstPart + ", " + fields[i].ToString() + " AS COLUMN" + (i + 1);
                   firstPart.Trim();
                   MyText = (TextObject)objRpt.ReportDefinition.ReportObjects[i + 1];
                   MyText.Text = fields[i].ToString();
               }
               else
               {
                   firstPart = firstPart + fields[i].ToString() + " AS COLUMN" + (i + 1);
                   firstPart.Trim();
                   MyText = ((TextObject)objRpt.ReportDefinition.ReportObjects[i + 1]);
                   MyText.Text = fields[i].ToString();
               }
           }
           sql = "SELECT " + firstPart + " " + lastPart;
           return sql;
       }
   }

任何帮助

Any Help

推荐答案

成员10205552写道：

Member 10205552 wrote:

我想在textbox1中编写我的sql代码，并且在button1的click事件中我应该在执行此操作时获取编写的sql代码的报告我收到错误无法将类型为'CrystalDecisions.CrystalReports.Engine.FieldObject'的对象强制转换为'CrystalDecisions.CrystalReports.Engine.TextObject'。我在这一行上得到这个错误MyText =（（TextObject）objRpt.ReportDefinition.ReportObjects [i + 1]）;

i want to write my sql code in textbox1 and on click event of button1 i should get the report of the written sql code while doing this i get an error "Unable to cast object of type 'CrystalDecisions.CrystalReports.Engine.FieldObject' to type 'CrystalDecisions.CrystalReports.Engine.TextObject'." i get this error on this line " MyText = ((TextObject)objRpt.ReportDefinition.ReportObjects[i + 1]);"

你选择了错误的基于错误的索引（i + 1）。并查看此主题 [ ^ ]了解更多详情。

You're selecting wrong object based wrong index(i+1). And check this thread[^] for more details.

尝试

Try

MyText=(TextObject)objRpt.ReportDefinition.ReportObject[i];

而不是

instead of

MyText=(TextObject)objRpt.ReportDefinition.ReportObject[i+1];

也许在最后一项上引发错误。检查，但我没有测试过。

Maybe the error is raised on the last item. Check, but I haven't tested.

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