product.cs

《C#数据库项目案例导航》一书的配套光盘

				this.textRemark.Enabled=false;
			}
		}

		private void ButtonEnableControl(bool valid)
		{
			if(valid)
			{
				this.btnCancel.Enabled=true;
				this.btnApply.Enabled=true;
			}
			else
			{
				this.btnCancel.Enabled=false;
				this.btnApply.Enabled=false;
			}
		}
						
		private void LoadDataSet()
		{
			DataSetProduct objDataSetTemp=new DataSetProduct();
			try
			{
				this.FillDataSet(objDataSetTemp);

			}
			catch (System.Exception E) 
			{
				// 在此处添加错误处理代码。
				this.ErrorHandle(E);
			}
			try
			{
				this.objDataSetProduct.Clear();
				this.objDataSetProduct.Merge(objDataSetTemp);
			}
			catch(System.Exception E) 
			{
				// 在此处添加错误处理代码。
				this.ErrorHandle(E);
			}
			
		}
		
		private void FillDataSet(DataSetProduct dataset)
		{
			dataset.EnforceConstraints=false;
			try
			{
				this.sqlConnection1.Open();
				this.sqlDataAdapter1.Fill(dataset);
			}
			catch(System.Exception E)
			{
				this.ErrorHandle(E);
			}
		
			finally
			{
				dataset.EnforceConstraints=true;
				this.sqlConnection1.Close();
			}
		}

		private void Product_Load(object sender, System.EventArgs e)
		{
			this.LoadDataSet();
			this.DatasetPostionChange();
			this.ButtonPositonChange();
			this.TextEnableControl(false);
			this.ButtonEnableControl(false);
		
		}
		
		private void btnNext_Click(object sender, System.EventArgs e)
		{
			this.BindingContext[this.objDataSetProduct,"Product"].Position+=1;
			this.ButtonPositonChange();
			this.DatasetPostionChange();

		}
		

		private void btnPrevious_Click(object sender, System.EventArgs e)
		{
			this.BindingContext[this.objDataSetProduct,"Product"].Position-=1;
			this.ButtonPositonChange();
			this.DatasetPostionChange();
		
		}

		private void btnFirst_Click(object sender, System.EventArgs e)
		{
			this.BindingContext[this.objDataSetProduct,"Product"].Position=0;
			this.ButtonPositonChange();
			this.DatasetPostionChange();
		}

		private void btnLast_Click(object sender, System.EventArgs e)
		{
			this.BindingContext[this.objDataSetProduct,"Product"].Position=this.BindingContext[this.objDataSetProduct,"Product"].Count-1;
			this.ButtonPositonChange();
			this.DatasetPostionChange();
		}		

		private void btnAdd_Click(object sender, System.EventArgs e)
		{
			try
			{
				this.BindingContext[this.objDataSetProduct,"Product"].AddNew();
			}
			catch(System.Exception E)
			{
				this.ErrorHandle(E);
			}
			this.DatasetPostionChange();
			this.ButtonPositonChange();	
			this.TextEnableControl(true);
			this.ButtonEnableControl(true);
		}

		private void btnDelete_Click(object sender, System.EventArgs e)
		{
			if((this.BindingContext[this.objDataSetProduct,"Product"].Count>0)&
				(MessageBox.Show("真的要删除此记录吗","确定删除",MessageBoxButtons.OKCancel,MessageBoxIcon.Question).Equals(DialogResult.OK)))
			{
				try
				{
					int currentPosition=this.BindingContext[this.objDataSetProduct,"Product"].Position;
					this.objDataSetProduct.Product.Rows[currentPosition].Delete();
				}
				catch(System.Exception E)
				{
					this.ErrorHandle(E);
				}
				this.ButtonPositonChange();
				this.DatasetPostionChange();
			}
			else
				return;
		}

		
		private void btnModify_Click(object sender, System.EventArgs e)
		{
			this.TextEnableControl(true);
			this.ButtonEnableControl(true);
		
		}

		private void btnQuery_Click(object sender, System.EventArgs e)
		{

		
		}
		
		public void UpdateDataSet()
		{
			this.BindingContext[this.objDataSetProduct,"Product"].EndCurrentEdit();
			DataSetProduct objDataSetTemp=new DataSetProduct();
			objDataSetTemp=(DataSetProduct)(this.objDataSetProduct.GetChanges());
			try
			{
				this.UpdateDataSource(objDataSetTemp);
				this.objDataSetProduct.Merge(objDataSetTemp);
				this.objDataSetProduct.AcceptChanges();
			}
			catch(System.Exception E)
			{
				this.ErrorHandle(E);
			}
		}
		

		public void UpdateDataSource(DataSetProduct Changerows)
		{
			Changerows.EnforceConstraints=false;
			try
			{
				this.sqlConnection1.Open();
				this.sqlDataAdapter1.Update(Changerows);
			}
			catch(System.Exception E)
			{
				this.ErrorHandle(E);
			}
			finally
			{
				this.sqlConnection1.Close();
				Changerows.EnforceConstraints=true;

			}	

		}

		private void btnApply_Click(object sender, System.EventArgs e)
		{
			try
			{
				this.UpdateDataSet();
			}
			catch(System.Exception E)
			{
				this.ErrorHandle(E);
			}			
			this.ButtonPositonChange();
			this.DatasetPostionChange();
			this.TextEnableControl(false);
			this.ButtonEnableControl(false);
		}

		private void btnCancel_Click(object sender, System.EventArgs e)
		{
			try
			{
				this.BindingContext[this.objDataSetProduct,"Product"].CancelCurrentEdit();
			}
			catch(System.Exception E)
			{
				this.ErrorHandle(E);
			}			
			this.DatasetPostionChange();
			this.TextEnableControl(false);
			this.TextEnableControl(false);
			this.ButtonEnableControl(false);
			
		}

		private void btnExit_Click(object sender, System.EventArgs e)
		{
			this.Close();
		}

		private void textRemark_TextChanged(object sender, System.EventArgs e)
		{
		
		}
		
		
	}
}