我正在尝试将表单数据插入数据库，但代码存在一些问题，我无法识别它。错误是：
mscorlib.dll 中出现类型为“System.FormatException”的未处理异常
附加信息：输入字符串的格式不正确。
Winform代码：
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.IO;
using System.Linq;
using System.Media;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
namespace MobShopManagSys
{
public partial class Product_AddForm : Form
{
ProductsDB db = new ProductsDB();
public Product_AddForm()
{
InitializeComponent();
}
private void SaveButton_Click(object sender, EventArgs e)
{
if (IsValidated()) //Proceed if required data is entered
{
db.InsertProductInDB(NameTextBox.Text, Convert.ToInt32(CategoryComboBox.SelectedValue), ModelTextBox.Text, SeriesComboBox.Text, Convert.ToInt32(SIMSlotsComboBox.Text), CarrierTypeComboBox.Text, GetReleaseDate(), Convert.ToInt32(RAMTextBox.Text), RAMMemUnitComboBox.Text, Convert.ToInt32(SecondryMemTextBox.Text), SecondMemUnitComboBox.Text, Convert.ToInt32(ExpandableTextBox.Text), ExpandableMemUnitComboBox.Text, OSVersionComboBox.Text, ProcessorComboBox.Text, ScreenSizeTextBox.Text, ScreenSizeTypeComboBox.Text, Convert.ToInt32(BatteryTextBox.Text), BatteryTypeComboBox.Text, CommentsTextBox.Text, Convert.ToInt32(SupplierComboBox.SelectedValue), float.Parse(PriceTextBox.Text), PriceUnitComboBox.Text, Convert.ToInt32(QuantityTextBox.Text), SaveProductPhoto());
MessageBox.Show("New Record is added successfully!", "Record Added", MessageBoxButtons.OK, MessageBoxIcon.Information);
}
}
private void CloseButton_Click(object sender, EventArgs e)
{
this.Close();
}
private void AddSupplierButton_Click(object sender, EventArgs e)
{
Suppliers_AddForm AddNewSupplierFrm = new Suppliers_AddForm();
AddNewSupplierFrm.ShowDialog();
//Reload Data into control
LoadFormControlsData();
}
private void ResetButton_Click(object sender, EventArgs e)
{
NameTextBox.Clear();
CategoryComboBox.Text = " ";
ModelTextBox.Clear();
SeriesComboBox.Text = null;
CarrierTypeComboBox.Text = null;
SIMSlotsComboBox.Text = null;
ReleaseDateTimePicker.CustomFormat = " ";
RAMTextBox.Clear();
RAMMemUnitComboBox.Text = null;
SecondryMemTextBox.Clear();
SecondMemUnitComboBox.Text = null;
ExpandableTextBox.Clear();
ExpandableMemUnitComboBox.Text = null;
OSVersionComboBox.Text = null;
ProcessorComboBox.Text = null;
ScreenSizeTextBox.Clear();
ScreenSizeTypeComboBox.Text = null;
BatteryTextBox.Clear();
BatteryTypeComboBox.Text = null;
CommentsTextBox.Clear();
SupplierComboBox.Text = null;
PriceTextBox.Clear();
PriceUnitComboBox.Text = null;
QuantityTextBox.Clear();
SystemSounds.Beep.Play();
NameTextBox.Focus();
}
private void Product_AddForm_Load(object sender, EventArgs e)
{
LoadFormControlsData();
}
private void LoadFormControlsData()
{
CategoryComboBox.DataSource = db.LoadCategoryComboBox();
CategoryComboBox.DisplayMember = "CategoryName";
CategoryComboBox.ValueMember = "CategoryID";
CategoryComboBox.SelectedIndex = -1;
SeriesComboBox.DataSource = db.LoadSeriesComboBox();
SeriesComboBox.DisplayMember = "Series";
SupplierComboBox.DataSource = db.LoadSupplierComboBox();
SupplierComboBox.DisplayMember = "Name";
SupplierComboBox.ValueMember = "SupplierID";
SupplierComboBox.SelectedIndex = -1;
}
private void AddNewCategoryButton_Click(object sender, EventArgs e)
{
Categories_AddForm AddCategoryFrm = new Categories_AddForm();
AddCategoryFrm.ShowDialog();
LoadFormControlsData();
}
private void ProductImagePictureBox_Click(object sender, EventArgs e)
{
OpenFileDialog ofd = new OpenFileDialog();
ofd.Title = "Select the Image";
ofd.Filter = "Image File (*.png;*.jpg;*.bmp;*.gif)|*.png;*.jpg;*.bmp;*.gif";
if (ofd.ShowDialog() == DialogResult.OK)
{
ProductImagePictureBox.Image = new Bitmap(ofd.FileName);
}
}
private byte[] SaveProductPhoto()
{
MemoryStream ms = new MemoryStream();
ProductImagePictureBox.Image.Save(ms, ProductImagePictureBox.Image.RawFormat);
return ms.GetBuffer();
}
private bool IsValidated() //Validation Method Defination
{
if (NameTextBox.Text.Trim() == "")
{
ValidationMessage(NameTextBox, "Name is required!");
return false;
}
if (CategoryComboBox.Text.Trim() == "")
{
ValidationMessage(CategoryComboBox, "Please select the Category/Brand!");
return false;
}
if (ModelTextBox.Text.Trim() == "")
{
ValidationMessage(ModelTextBox, "Model is required!");
return false;
}
if (RAMTextBox.Text.Trim() == "")
{
ValidationMessage(RAMTextBox, "RAM memory required!");
return false;
}
else
{
float outRAM;
if(!float.TryParse(RAMTextBox.Text, out outRAM))
{
ValidationMessage(RAMTextBox, "RAM field only contain numbers!");
return false;
}
}
if (RAMMemUnitComboBox.Text.Trim() == "")
{
ValidationMessage(RAMMemUnitComboBox, "Please select a Memory Unit!");
return false;
}
if (SecondryMemTextBox.Text.Trim() == "")
{
ValidationMessage(SecondryMemTextBox, "Secondry memory field is required!");
return false;
}
else
{
float outSecMem;
if (!float.TryParse(RAMTextBox.Text, out outSecMem))
{
ValidationMessage(RAMTextBox, "Secondry memory field only contain numbers!");
return false;
}
}
if (SecondMemUnitComboBox.Text.Trim() == "")
{
ValidationMessage(SecondMemUnitComboBox, "Please select a Memory Unit!");
return false;
}
if (ExpandableTextBox.Text != "")
{
int outexpmem;
if (!int.TryParse(ExpandableTextBox.Text, out outexpmem))
{
ValidationMessage(ExpandableTextBox, "Expandable memory can only numbers!");
return false;
}
if (ExpandableMemUnitComboBox.Text.Trim() == "")
{
ValidationMessage(ExpandableMemUnitComboBox, "Please select a Memory Unit!");
return false;
}
}
if (OSVersionComboBox.Text.Trim() == "")
{
ValidationMessage(OSVersionComboBox, "OS Version selection is required!");
return false;
}
if (BatteryTextBox.Text.Trim() == "")
{
ValidationMessage(BatteryTextBox, "Battery Capacity required!");
return false;
}
if (BatteryTypeComboBox.Text.Trim() == "")
{
ValidationMessage(BatteryTypeComboBox, "Please select a Battery Capacity Unit!");
return false;
}
if(PriceTextBox.Text != "" )
{
float outexpmem;
if (!float.TryParse(PriceTextBox.Text, out outexpmem))
{
ValidationMessage(PriceTextBox, "Purchase Price only numbers!");
return false;
}
if (PriceUnitComboBox.Text.Trim() == "")
{
ValidationMessage(PriceUnitComboBox, "Please select Currency Unit!");
return false;
}
}
if (QuantityTextBox.Text.Trim() == "")
{
ValidationMessage(QuantityTextBox, "Quantity of Product is required!");
return false;
}
else
{
int outQuantity;
if (!int.TryParse(QuantityTextBox.Text, out outQuantity))
{
ValidationMessage(QuantityTextBox, "Quantity can only in numbers!");
return false;
}
}
return true;
}
private void ValidationMessage(Control ctrl, string ValidationMsg) //Validation Message Def.
{
ctrl.BackColor = Color.LightPink;
MessageBox.Show(ValidationMsg, "Validation Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
ctrl.Focus();
}
private void ctrl_TextChanged(object sender, EventArgs e) //Back change color to white
{
Control ctrl = (Control)sender;
ctrl.BackColor = Color.White;
}
private void ClearCommentsButton_Click(object sender, EventArgs e)
{
CommentsTextBox.Clear();
CommentsTextBox.Focus();
}
//Date Time Picker <Start>
private void ReleaseDateTimePicker_ValueChanged(object sender, EventArgs e)
{
ReleaseDateTimePicker.CustomFormat = "dd/MM/yyyy";
}
private void ReleaseDateTimePicker_KeyDown(object sender, KeyEventArgs e)
{
if(e.KeyCode==Keys.Back || e.KeyCode == Keys.Delete)
{
ReleaseDateTimePicker.CustomFormat = " ";
}
}
private DateTime? GetReleaseDate()
{
if (ReleaseDateTimePicker.Text.Trim() == string.Empty)
{
return (DateTime?)null;
}
else
return ReleaseDateTimePicker.Value.Date;
}
} //Date Time Picker <End>
}
这行代码中的错误：
db.InsertProductInDB(NameTextBox.Text, Convert.ToInt32(CategoryComboBox.SelectedValue), ModelTextBox.Text, SeriesComboBox.Text, Convert.ToInt32(SIMSlotsComboBox.Text), CarrierTypeComboBox.Text, GetReleaseDate(), Convert.ToInt32(RAMTextBox.Text), RAMMemUnitComboBox.Text, Convert.ToInt32(SecondryMemTextBox.Text), SecondMemUnitComboBox.Text, Convert.ToInt32(ExpandableTextBox.Text), ExpandableMemUnitComboBox.Text, OSVersionComboBox.Text, ProcessorComboBox.Text, ScreenSizeTextBox.Text, ScreenSizeTypeComboBox.Text, Convert.ToInt32(BatteryTextBox.Text), BatteryTypeComboBox.Text, CommentsTextBox.Text, Convert.ToInt32(SupplierComboBox.SelectedValue), float.Parse(PriceTextBox.Text), PriceUnitComboBox.Text, Convert.ToInt32(QuantityTextBox.Text), SaveProductPhoto());
using System;
using System.Collections.Generic;
using System.Configuration;
using System.Data;
using System.Data.SqlClient;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
namespace MobShopManagSys
{
class ProductsDB
{
string connString = ConfigurationManager.ConnectionStrings["DBCS"].ConnectionString;
//Add Product Form
public void InsertProductInDB(string Name, int CategoryID, string Model, string Series, int SIMSlots, string CarrierType, DateTime? ReleaseDate, int RAM, string RAMMemUnit, int SecondryMem, string SecondMemUnit, int Expandable, string ExpandableMemUnit, string OSVersion, string Processor, string ScreenSize, string ScreenSizeType, int Battery, string BatteryType, string Comments, int SupplierID, float Price, string PriceUnit, int UnitsInStock, byte[] SaveProductPhoto)
{
using (SqlConnection conn = new SqlConnection(connString))
{
using (SqlCommand cmd = new SqlCommand("spProducts_InsertProduct", conn))
{
cmd.CommandType = CommandType.StoredProcedure;
//Parameters
cmd.Parameters.AddWithValue("@Name", Name);
cmd.Parameters.AddWithValue("@CategoryID", CategoryID);
cmd.Parameters.AddWithValue("@Model", Model);
cmd.Parameters.AddWithValue("@Series", Series);
cmd.Parameters.AddWithValue("@SIMSlots", SIMSlots);
cmd.Parameters.AddWithValue("@CarrierType", CarrierType);
cmd.Parameters.AddWithValue("@ReleaseDate", ReleaseDate);
cmd.Parameters.AddWithValue("@RAM", RAM);
cmd.Parameters.AddWithValue("@RAMMemUnit", RAMMemUnit);
cmd.Parameters.AddWithValue("@SecondryMem", SecondryMem);
cmd.Parameters.AddWithValue("@SecondMemUnit", SecondMemUnit);
cmd.Parameters.AddWithValue("@Expandable", Expandable);
cmd.Parameters.AddWithValue("@ExpandableMemUnit", ExpandableMemUnit);
cmd.Parameters.AddWithValue("@OSVersion", OSVersion);
cmd.Parameters.AddWithValue("@Processor", Processor);
cmd.Parameters.AddWithValue("@ScreenSize", ScreenSize);
cmd.Parameters.AddWithValue("@ScreenSizeType", ScreenSizeType);
cmd.Parameters.AddWithValue("@Battery", Battery);
cmd.Parameters.AddWithValue("@BatteryType", BatteryType);
cmd.Parameters.AddWithValue("@Comments", Comments);
cmd.Parameters.AddWithValue("@SupplierID", SupplierID);
cmd.Parameters.AddWithValue("@PurchasePrice", Price);
cmd.Parameters.AddWithValue("@PurchasePriceUnit", PriceUnit);
cmd.Parameters.AddWithValue("@UnitsInStock", UnitsInStock);
cmd.Parameters.AddWithValue("@ProductPhoto", SaveProductPhoto);
//Connection
conn.Open();
//Execution
cmd.ExecuteNonQuery();
}
}
}
public DataTable LoadCategoryComboBox()
{
DataTable categoryComboboxValues = new DataTable();
using (SqlConnection conn = new SqlConnection(connString))
{
using (SqlCommand cmd = new SqlCommand("spProducts_GetAllCategories", conn))
{
cmd.CommandType = CommandType.StoredProcedure;
conn.Open();
SqlDataReader reader = cmd.ExecuteReader();
categoryComboboxValues.Load(reader);
}
}
return categoryComboboxValues;
}
public DataTable LoadSeriesComboBox()
{
DataTable seriesComboBoxValues = new DataTable();
using(SqlConnection conn = new SqlConnection(connString))
{
using(SqlCommand cmd = new SqlCommand("spProducts_GetAllSeries", conn))
{
cmd.CommandType = CommandType.StoredProcedure;
conn.Open();
SqlDataReader reader = cmd.ExecuteReader();
seriesComboBoxValues.Load(reader);
}
}
return seriesComboBoxValues;
}
public DataTable LoadSupplierComboBox()
{
DataTable supplierComboBoxValues = new DataTable();
using (SqlConnection conn = new SqlConnection(connString))
{
using (SqlCommand cmd = new SqlCommand("spProducts_GetAllSuppliers", conn))
{
cmd.CommandType = CommandType.StoredProcedure;
conn.Open();
SqlDataReader reader = cmd.ExecuteReader();
supplierComboBoxValues.Load(reader);
}
}
return supplierComboBoxValues;
}
}
}
ALTER Procedure [dbo].[spProducts_InsertProduct]
@Name nvarchar(50)
,@CategoryID int
,@Model nvarchar(50)
,@Series nvarchar(50)
,@SIMSlots int
,@CarrierType nvarchar(20)
,@ReleaseDate DateTime = null
,@RAM int
,@RAMMemUnit nvarchar(20)
,@SecondryMem int
,@SecondMemUnit nvarchar(20)
,@Expandable int
,@ExpandableMemUnit nvarchar(20)
,@OSVersion nvarchar(50)
,@Processor nvarchar(50)
,@ScreenSize nvarchar(50)
,@ScreenSizeType nvarchar(20)
,@Battery int
,@BatteryType nvarchar(20)
,@Comments nvarchar(MAX)
,@SupplierID int
,@Price float
,@PriceUnit nvarchar(20)
,@UnitsInStock int
,@ProductPhoto IMAGE
As
Begin
INSERT INTO tblProducts(Name,CategoryID,Model,Series,SIMSlots,CarrierType,ReleaseDate,RAM,RAMMemUnit,SecondryMem,SecondMemUnit,Expandable,ExpandableMemUnit,OSVersion,Processor,ScreenSize,ScreenSizeType,Battery,BatteryType,Comments,SupplierID,Price,PriceUnit, UnitsInStock, Product_Photo)
VALUES(@Name,@CategoryID,@Model,@Series,@SIMSlots,@CarrierType,@ReleaseDate,@RAM,@RAMMemUnit,@SecondryMem,@SecondMemUnit,@Expandable,@ExpandableMemUnit,@OSVersion,@Processor,@ScreenSize,@ScreenSizeType,@Battery,@BatteryType,@Comments,@SupplierID,@Price,@PriceUnit,@UnitsInStock, @ProductPhoto)
End
请帮帮我，我被困在这里两天了。谢谢！
如果文本框不为空，则此验证有效
if (ExpandableTextBox.Text != "")
{
int outexpmem;
if (!int.TryParse(ExpandableTextBox.Text, out outexpmem))
{
ValidationMessage(ExpandableTextBox, "Expandable memory can only numbers!");
return false;
}
if (ExpandableMemUnitComboBox.Text.Trim() == "")
{
ValidationMessage(ExpandableMemUnitComboBox, "Please select a Memory Unit!");
return false;
}
}
但是您遇到错误的那一行是Convert.ToInt32(ExpandableTextBox.Text)在每种情况下都尝试这样做。
如果 ExpandableTextBox 文本为空，此行将抛出您收到的错误
db.InsertProductInDB(NameTextBox.Text, Convert.ToInt32(CategoryComboBox.SelectedValue), ModelTextBox.Text, SeriesComboBox.Text, Convert.ToInt32(SIMSlotsComboBox.Text), CarrierTypeComboBox.Text, GetReleaseDate(), Convert.ToInt32(RAMTextBox.Text), RAMMemUnitComboBox.Text, Convert.ToInt32(SecondryMemTextBox.Text), SecondMemUnitComboBox.Text, Convert.ToInt32(ExpandableTextBox.Text), ExpandableMemUnitComboBox.Text, OSVersionComboBox.Text, ProcessorComboBox.Text, ScreenSizeTextBox.Text, ScreenSizeTypeComboBox.Text, Convert.ToInt32(BatteryTextBox.Text), BatteryTypeComboBox.Text, CommentsTextBox.Text, Convert.ToInt32(SupplierComboBox.SelectedValue), float.Parse(PriceTextBox.Text), PriceUnitComboBox.Text, Convert.ToInt32(QuantityTextBox.Text), SaveProductPhoto());
您可以为可选字段尝试这样的操作 Convert.ToInt32(!string.IsNullOrEmpty(ExpandableTextBox.Text)?ExpandableTextBox.Text :"0")
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