在水晶报表中实现任意选择指定字段显示(Asp.net+c#版)

在阿泰的软件实用主义中看到vb版的在“水晶报表中实现任意选择指定字段显示”这篇文章

便有了把这个版本改写成web版的想法

由于以前对vb这门语言不是很熟悉，所以还是用了一些时间，设计过程请参见：http://www.cnblogs.com/babyt/articles/142309.html

公开代码如下：

//********************************************

//*

//* 此程序完成“自定义字段显示报表功能”

//*

//********************************************

using System;

using System.Collections;

using System.ComponentModel;

using System.Data;

using System.Drawing;

using System.Web;

using System.Web.SessionState;

using System.Web.UI;

using System.Web.UI.WebControls;

using System.Web.UI.HtmlControls;

using CrystalDecisions.Shared;

using CrystalDecisions.CrystalReports .Engine;

using System.Data.SqlClient;

namespace Crystal_Report

{

/// <summary>

/// WebForm1 的摘要说明。

/// </summary>

public class WebForm1 : System.Web.UI.Page

{

protected System.Web.UI.WebControls.Button Button1;

protected System.Web.UI.WebControls.CheckBox CheckBox1;

protected System.Web.UI.WebControls.CheckBox CheckBox2;

protected System.Web.UI.WebControls.CheckBox CheckBox3;

protected System.Web.UI.WebControls.CheckBox CheckBox4;

protected System.Web.UI.WebControls.CheckBox CheckBox5;

protected System.Web.UI.WebControls.CheckBox CheckBox6;

protected System.Web.UI.WebControls.Label Label1;

protected System.Web.UI.WebControls.DataGrid dgNameList1;

protected CrystalDecisions.Web.CrystalReportViewer CrystalReportViewer1;

private void Page_Load(object sender, System.EventArgs e)

{

Label1.Text="";

}

#region Web 窗体设计器生成的代码

override protected void OnInit(EventArgs e)

{

//

// CODEGEN: 该调用是 ASP.NET Web 窗体设计器所必需的。

//

InitializeComponent();

base.OnInit(e);

}

/// <summary>

/// 设计器支持所需的方法 - 不要使用代码编辑器修改

/// 此方法的内容。

/// </summary>

private void InitializeComponent()

{

this.Button1.Click += new System.EventHandler(this.Button1_Click);

this.Load += new System.EventHandler(this.Page_Load);

}

#endregion

private void Button1_Click(object sender, System.EventArgs e)

{

string ConnectionStr="";

string SqlStr="";

string FieldStr="";

string [] FieldArray;

ParameterFields ParamFields = new ParameterFields();

//ParameterField ParamField = new ParameterField();

//ParameterDiscreteValue DiscreteVal = new ParameterDiscreteValue();

int i,j;

if(CheckBox1.Checked == true)

FieldStr=CheckBox1.Text;

if(CheckBox2.Checked == true)

FieldStr=FieldStr+","+CheckBox2.Text;

if(CheckBox3.Checked == true)

FieldStr=FieldStr+","+CheckBox3.Text;

if(CheckBox4.Checked == true)

FieldStr=FieldStr+","+CheckBox4.Text;

if(CheckBox5.Checked == true)

FieldStr=FieldStr+","+CheckBox5.Text;

if(CheckBox6.Checked == true)

FieldStr=FieldStr+","+CheckBox6.Text;

if(FieldStr=="")

{

Label1.Text="请选择要显示的字段";

return;

}

if (FieldStr.Substring(0,1)==",")

FieldStr = FieldStr.Substring(1, FieldStr.Length - 1);

FieldArray = FieldStr.Split(',');

ConnectionStr="data source=localhost;uid=sa;pwd=12345;database=Pubs";

SqlConnection SqlConn = new SqlConnection(ConnectionStr);

SqlStr="Select " + FieldStr + " From 材料采购明细" ;

SqlDataAdapter SqlAdapter = new SqlDataAdapter(SqlStr,SqlConn);

DataSet dataset = new DataSet();

SqlAdapter.Fill(dataset, "材料采购明细");

dgNameList1.DataSource = dataset.Tables["材料采购明细"].DefaultView;

dgNameList1.DataBind();

CrystalReport crReportDocument = new CrystalReport();

for(i=0;i<FieldArray.Length;i++)

{

ParameterField ParamField = new ParameterField();

ParamField.ParameterFieldName = "myParaField"+Convert.ToString(i+1);//设置要修改的参数的名称

ParameterDiscreteValue DiscreteVal = new ParameterDiscreteValue();

DiscreteVal.Value=FieldArray[i];

ParamField.CurrentValues.Add(DiscreteVal);

ParamFields.Add(ParamField);

//ParamField.AllowCustomValues = false;

string MyStr="myField"+Convert.ToString(i+1);

crReportDocument.DataDefinition.FormulaFields[MyStr].Text = "{材料采购明细." + FieldArray[i] + "}";

//string temp = crReportDocument.DataDefinition.FormulaFields[MyStr].Text;

}

for(j=i+1;j<=6;j++)

{

ParameterField ParamField = new ParameterField();

ParamField.ParameterFieldName = "myParaField" + Convert.ToString(j);

ParamFields.Add(ParamField);

ParameterDiscreteValue DiscreteVal = new ParameterDiscreteValue();

DiscreteVal.Value = "";

ParamField.CurrentValues.Add(DiscreteVal);

ParamFields.Add(ParamField);

//ParamField.AllowCustomValues = False;

}

CrystalReportViewer1.ParameterFieldInfo = ParamFields;

crReportDocument.SetDataSource(dataset);

CrystalReportViewer1.ReportSource = crReportDocument;

}

}

}