如何在Crystal报表中显示空白图像 [英] How to Show Blank Image In Crystal report

问题描述

通过以下过程，我正在将图像显示到Crystal报表中

By Below Procedure I am Displaying Image to Crystal Report

首先：我在数据集的数据表中创建了一个新列（图像）并更改了数据类型到System.Byte（）

First: I created a New Column ("Image") in a datatable of the dataset and change the DataType to System.Byte()

第二个：将此图像拖放到我想要的位置。

Second : Drag And drop this image Filed Where I want.

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();

    }

//通过此功能，我将我的图像数据合并到dataTable中

// By this Function I merge My Image data into 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

    }

当我在路径上有图像但是
时，这很理想，当用户在指定路径上不给图像时，
我想显示空白-
但是我得到了空白图像请帮助我..

this Works Perfectly when I have Image on path but I want to Show Empty- blank Space when user Not Give Image on Specify path, But I get blank Square as per given Image with border how to remove it please help me ..

推荐答案

使用报告自身的抑制功能

Use the suppress function from the report it self,

右键单击图像对象>>格式对象>>填充抑制一词旁边的复选框，然后单击抑制右边的公式，然后添加所需的公式，例如：

Right click on the image object >> format object >> Fill the check box near the word suppress then click on the formula on the right of suppress then add the formula you require some thing like:

ISNULL({Class;1.Img})

这篇关于如何在Crystal报表中显示空白图像的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！