Unable to cast object of type 'system.int32' to type 'system.byte[]'.

Question

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i design desktop application for Customer
i coding Edit Form
My Error is
Unable to cast object of type 'System.Int32' to type 'System.Byte[]'.
i clicked f10 to debug my Application
My Error Here
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C#

byte[] pa_img = (byte[])Customer_Function.Customer_Operation.Show_Customer_Image(Convert.ToInt32(this.dataGridView_ShowData.CurrentRow.Cells[0].Value )).Rows[0][0];  my Error Here

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Error Is
Unable to cast object of type 'System.Int32' to type 'System.Byte[]'.

What I have tried:

C#

private void btn_Edit_Click(object sender, EventArgs e)
        {
            Add_New_FORM add_New_FORM = new Add_New_FORM();
            add_New_FORM.btn_Add.Visible = false;
            add_New_FORM.btn_Delete.Visible = false;


            add_New_FORM.ID_TextBox.Text = this.dataGridView_ShowData.CurrentRow.Cells[0].Value.ToString();
            add_New_FORM.Name_TextBox.Text = this.dataGridView_ShowData.CurrentRow.Cells[1].Value.ToString();
            add_New_FORM.phone_TextBox.Text = this.dataGridView_ShowData.CurrentRow.Cells[2].Value.ToString();
            add_New_FORM.kind_TextBox.Text = this.dataGridView_ShowData.CurrentRow.Cells[3].Value.ToString();
            add_New_FORM.textBox4.Text = this.dataGridView_ShowData.CurrentRow.Cells[4].Value.ToString();
            add_New_FORM.FirstDate_TextBox.Text = this.dataGridView_ShowData.CurrentRow.Cells[5].Value.ToString();
            add_New_FORM.End_Date.Text = this.dataGridView_ShowData.CurrentRow.Cells[6].Value.ToString();
            add_New_FORM.Cost_TextBox.Text = this.dataGridView_ShowData.CurrentRow.Cells[7].Value.ToString();
            add_New_FORM.Paid_TextBox.Text = this.dataGridView_ShowData.CurrentRow.Cells[8].Value.ToString();
            add_New_FORM.remain_TextBox.Text = this.dataGridView_ShowData.CurrentRow.Cells[9].Value.ToString();
            add_New_FORM.NotesAboutTRAINING_TextBox.Text = this.dataGridView_ShowData.CurrentRow.Cells[10].Value.ToString();
           


  byte[] pa_img = (byte[])Customer_Function.Customer_Operation.Show_Customer_Image(Convert.ToInt32(this.dataGridView_ShowData.CurrentRow.Cells[0].Value )).Rows[0][0];
            MemoryStream ms = new MemoryStream(pa_img);
            add_New_FORM.pictureBox_ForTRAINER.Image = Image.FromStream(ms);
            add_New_FORM.ShowDialog();
        }

Posted 3-Apr-22 11:50am

ahmedbelal

Updated 4-Apr-22 5:55am

PIEBALDconsult

v2

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Comments

Afzaal Ahmad Zeeshan 3-Apr-22 20:32pm

The exception says that you are trying to convert a number to an array of bytes.

The main I see in your code is that it is confusing to read what is happening. You are doing a lot of things in a single statement, and thus, losing a track of what should happen where.

For example, this link

(byte[]) Customer_Function.Customer_Operation.Show_Customer_Image(Convert.ToInt32(this.dataGridView_ShowData.CurrentRow.Cells[0].Value)).Rows[0][0];

. I would write it differently. Reading the source and assignment to a destination should be done in two-fold; unless you know what you're doing.

Try to break these statements into two, and debug to see what is the output.

Oh, and if you are converting a variable of type int to a byte[] for an image. I'm guessing the input is not an image in its integer form either.

ahmedbelal 4-Apr-22 11:47am

Dear Afzaal Ahmed
I want to design Edit Form in windows form
Customer_Function CLass that has all Funtion i will need
Show_Customer_Image function to showimage in datagridView
want to equal data in textbox or picturebox with Row in DataGridView
Thanks my Dear Afzaal Ahmed

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M Imran Ansari · Answer 1 · 2022-04-03T17:31:00

In exception, error showing you are converting byte[] to int. Below line of code is throwing this exception Where you are converting
byte[] pa_img =(byte[])Customer_Function.Customer_Operation.Show_Customer_Image(Convert.ToInt32(this.dataGridView_ShowData.CurrentRow.Cells[0].Value )).Rows[0][0];

Use the following code but not sure what type of Show_Customer_Image() is expecting, Pass your value according to the expected data type, that should be byte[].

byte[] pa_img = (byte[])Customer_Function.Customer_Operation.Show_Customer_Image((byte[])this.dataGridView_ShowData.CurrentRow.Cells[0].Value).Rows[0][0];