book.cs

visualc#+sql图书出租管理系统

		private void ButtonPositonChange()
		{
			this.btnPrevious.Enabled=true;
			this.btnNext.Enabled=true;
			this.btnFirst.Enabled=true;
			this.btnLast.Enabled=true;
			if(this.BindingContext[this.objDataSetBook,"Book"].Position==0)
			{
				this.btnFirst.Enabled=false;
				this.btnPrevious.Enabled=false;
			}
			if(this.BindingContext[this.objDataSetBook,"Book"].Position==this.BindingContext[this.objDataSetBook,"Book"].Count-1)
			{
				this.btnNext.Enabled=false;
				this.btnLast.Enabled=false;
			}
		}
		
		private void DatasetPostionChange()
		{
			this.lblDatasetPosition.Text=(this.BindingContext[this.objDataSetBook,"Book"].Position+1)+"的"+
				(this.BindingContext[this.objDataSetBook,"Book"].Count);
		}

		private void TextEnableControl(bool valid)
		{
			if(valid)
			{
				this.textId.Enabled=true;
				this.textName.Enabled=true;
				this.textPrice.Enabled=true;
				this.textPublish.Enabled=true;				
				this.textPublishDate.Enabled=true;
				this.textWriter.Enabled=true;
				this.textSort.Enabled=true;
				this.textAmount.Enabled=true;
				this.textRemain.Enabled=true;				
				
			}
			else
			{
				this.textId.Enabled=false;
				this.textName.Enabled=false;								
				this.textPrice.Enabled=false;
				this.textPublish.Enabled=false;				
				this.textPublishDate.Enabled=false;
				this.textWriter.Enabled=false;
				this.textSort.Enabled=false;
				this.textAmount.Enabled=false;
				this.textRemain.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()
		{
			DataSetBook objDataSetTemp=new DataSetBook();
			try
			{
				this.FillDataSet(objDataSetTemp);

			}
			catch (System.Exception E) 
			{
				// 在此处添加错误处理代码。
				this.ErrorHandle(E);
			}
			try
			{
				this.objDataSetBook.Clear();
				this.objDataSetBook.Merge(objDataSetTemp);
			}
			catch(System.Exception E) 
			{
				// 在此处添加错误处理代码。
				this.ErrorHandle(E);
			}
			
		}
		
		private void FillDataSet(DataSetBook 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 Book_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.objDataSetBook,"Book"].Position+=1;
			this.ButtonPositonChange();
			this.DatasetPostionChange();

		}
		

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

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

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

		private void btnAdd_Click(object sender, System.EventArgs e)
		{
			try
			{
				this.BindingContext[this.objDataSetBook,"Book"].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.objDataSetBook,"Book"].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.objDataSetBook,"Book"].Position;
					this.objDataSetBook.Book.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);
		
		}


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

		public void UpdateDataSource(DataSetBook Changerows)
		{
			try
			{
				this.sqlConnection1.Open();
				this.sqlDataAdapter1.Update(Changerows);
			}
			catch(System.Exception E)
			{
				this.ErrorHandle(E);
			}
			finally
			{
				this.sqlConnection1.Close();

			}	
		}

		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.objDataSetBook,"Book"].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();
		}

	

	}
}