如何在Crystal报表中显示空白图像

时间:2014-06-07 05:13:06

标签: c# crystal-reports

通过以下程序我将图像显示到Crystal Report

首先:我在数据集的数据表中创建了一个新列(" Image"),并将DataType更改为System.Byte()

第二步:将此图像拖放到我想要的位置。

private void LoadReport()
    {
        frmCheckWeigher rpt = new frmCheckWeigher();
        CryRe_DailyBatch report = new CryRe_DailyBatch();
        DataSet1TableAdapters.DataTable_DailyBatch1TableAdapter ta = new CheckWeigherReportViewer.DataSet1TableAdapters.DataTable_DailyBatch1TableAdapter();
        DataSet1.DataTable_DailyBatch1DataTable table = ta.GetData(clsLogs.strStartDate_rpt, clsLogs.strBatchno_Rpt, clsLogs.cmdeviceid); // Data from Database
        DataTable dt = GetImageRow(table, "Footer.Jpg");

        report.SetDataSource(dt);
        crv1.ReportSource = report;
        crv1.Refresh();

    }

//通过此函数,我将My Image数据合并到dataTable

private DataTable GetImageRow(DataTable dt, string ImageName)
    {

        try
        {

            FileStream fs;
            BinaryReader br;

            if (File.Exists(AppDomain.CurrentDomain.BaseDirectory + ImageName))
            {
                fs = new FileStream(AppDomain.CurrentDomain.BaseDirectory + ImageName, FileMode.Open);
            }
            else
            {
                // if photo does not exist show the Blank Space or Show Nothing 
               for (int i = 0; i < dt.Rows.Count; i++)
                {
                      dt.Rows[i]["Image"] = DBNull.Value  ;

                }
                return dt; 
            }
            // initialise the binary reader from file streamobject 
            br = new BinaryReader(fs);
            // define the byte array of filelength 
            byte[] imgbyte = new byte[fs.Length + 1];
            // read the bytes from the binary reader 
            imgbyte = br.ReadBytes(Convert.ToInt32((fs.Length)));

                for (int i = 0; i < dt.Rows.Count; i++)
                {
                     dt.Rows[i]["Image"] = imgbyte;

                }


            br.Close();
            // close the binary reader 
            fs.Close();
            // close the file stream 




        }
        catch (Exception ex)
        {
            // error handling 
            MessageBox.Show("Missing " + ImageName + " in application folder");
        }
        return dt;
        // Return Datatable After Image Row Insertion

    }

这个作品当我在路径上有图像时完美无缺 我想在用户未指定路径上的图像时显示空白空间, 但是我得到了空白的Square,因为给定的图像有边框如何删除它请帮帮我.. enter image description here

1 个答案:

答案 0 :(得分:2)

使用报告中的抑制功能,

  

右键单击图像对象&gt;&gt;格式对象&gt;&gt;填写单词抑制附近的复选框,然后单击禁止右侧的公式然后添加您需要的公式,如:

ISNULL({Class;1.Img})