是什么阻止了 Combobox SelectedValue 的设置？
What is preventing Combobox SelectedValue from setting?
我有几个组合框，所有代码都相似，只有一个 CustomerSelector.SelectedValue 不工作。我什至尝试过这样设置值：CustomerSelector.SelectedValue=32.
该方法用于将所有项目信息加载到窗体中，在窗体加载事件中调用。数据似乎加载正常，我什至已将 'id' 加载到 DisplayMember 以进行验证。
知道是什么阻止了 SelectedValue 的设置吗？
void loadProjectInfo()
{
if (isProjectInfoLoaded == false)
{
try
{
DataTable dt4 = new DataTable();
DBConnector db4 = new DBConnector();
db4.query = "SELECT * FROM s1_pm_project WHERE id=" + JobID;
dt4 = db4.getDataTable();
DataRow PMProject = dt4.Rows[0];
ProjectNameTextbox.Text = PMProject["ProjectName"].ToString();
this.Text = ProjectNameTextbox.Text;
ProjectAddressTextbox.Text = PMProject["Address"].ToString();
ProjectAddressCity.Text = PMProject["City"].ToString();
ProjectAddressState.DataSource = USStates.States();
ProjectAddressState.ValueMember = "Abbreviations";
ProjectAddressState.DisplayMember = "Abbreviations";
ProjectAddressState.SelectedIndex = -1;
if (!Convert.IsDBNull(PMProject["State"]))
ProjectAddressState.SelectedValue = PMProject["State"].ToString();
ProjectAddressPostalCode.Value = (!Convert.IsDBNull(PMProject["ZipCode"])) ? Convert.ToInt32(PMProject["ZipCode"]) : 00000;
DBConnector db5 = new DBConnector();
db5.query = "SELECT id, Name FROM s1_customer ORDER BY Name ASC";
CustomerSelector.DisplayMember = "Name";
CustomerSelector.ValueMember = "id";
CustomerSelector.DataSource = db5.getDataTable();
CustomerSelector.SelectedIndex = -1;
//if (!Convert.IsDBNull(PMProject["CustomerID"]))
// CustomerSelector.SelectedValue = Convert.ToInt32(PMProject["CustomerID"]);
CustomerSelector.SelectedValue=32;
DBConnector db1 = new DBConnector();
db1.query = "SELECT id, description FROM s1_app_status WHERE id < 2";
ProjectInfo_Status.DataSource = db1.getDataTable();
ProjectInfo_Status.DisplayMember = "description";
ProjectInfo_Status.ValueMember = "id";
ProjectInfo_Status.SelectedValue = Convert.ToInt32(PMProject["IsActive"]);
DBConnector db2 = new DBConnector();
db2.query = "SELECT id, description FROM s1_pm_roll";
ProjectInfoRollSelector.DataSource = db2.getDataTable();
ProjectInfoRollSelector.ValueMember = "id";
ProjectInfoRollSelector.DisplayMember = "description";
ProjectInfoRollSelector.SelectedIndex = -1;
if (Convert.ToInt32(PMProject["RollID"]) > 0)
ProjectInfoRollSelector.SelectedValue = Convert.ToInt32(PMProject["RollID"]);
DBConnector db3 = new DBConnector();
db3.query = "SELECT id, fullname FROM s1_user WHERE id>1";
ProjectInfoPMSelector.DataSource = db3.getDataTable();
ProjectInfoPMSelector.ValueMember = "id";
ProjectInfoPMSelector.DisplayMember = "fullname";
ProjectInfoPMSelector.SelectedIndex = -1;
if (Convert.ToInt32(PMProject["PMID"]) > 0)
ProjectInfoPMSelector.SelectedValue = Convert.ToInt32(PMProject["PMID"]);
ProjectInfoJobNoTextbox.Text = PMProject["JobNo"].ToString();
ProjectInfoValueTextbox.Value = Convert.ToDecimal(PMProject["ApproxValue"]);
if (!Convert.IsDBNull(PMProject["StartDate"]))
StartDateSelector.Value = Convert.ToDateTime(PMProject["StartDate"]);
if (!Convert.IsDBNull(PMProject["ProjectedEndDate"]))
ProjectedEndDateSelector.Value = Convert.ToDateTime(PMProject["ProjectedEndDate"]);
if (!Convert.IsDBNull(PMProject["EndDate"]))
EndDateSelector.Value = Convert.ToDateTime(PMProject["EndDate"]);
CustomerPOTextbox.Text = PMProject["CustomerPO"].ToString();
SalesTaxRateTextbox.Value = Convert.ToDecimal(PMProject["SalesTaxRate"]);
if (!Convert.IsDBNull(PMProject["WarrantyBegin"]))
WarrantyBegin.Value = Convert.ToDateTime(PMProject["WarrantyBegin"]);
if (!Convert.IsDBNull(PMProject["WarrantyEnd"]))
WarrantyEnd.Value = Convert.ToDateTime(PMProject["WarrantyEnd"]);
loadContactList();
}
catch (Exception ex)
{
Errors.Exception(ex);
}
isProjectInfoLoaded = true;
}
}
这是 SELECT id, Name FROM s1_customer ORDER BY Name ASC 的输出：
id
Name
22
18-8 Sherman Oaks
206
Alejo Lugo
233
Americo Builders, LLC
235
AMS Solutions, Inc
1
ARRIS Builders, Inc.
209
Chris Thrower
105
CME Refrigeration Controls
53
Coastline Provisions
117
Cortech Construction, Inc
6
Development Support Services, Inc.
146
East Bay Restaurant Supply Inc
31
Fitness Mania
7
Fulcrum Construction
32
Hardesty & Associates, Inc.
135
Howards Appliances, Inc.
9
J Ray Construction
10
J&L Metal Products
12
Jahanna L. Nichols Interior Design, Inc
69
James Barb Construction, Inc
61
JRE Construction, Inc.
13
Kamran and Company, Inc.
15
LA Deli Distributors, Inc.
98
Lovisa America, LLC
40
Mobile Customer
120
N CORONA
180
N SANTA CLARA
5
N SERVICE SALE
129
Orangecrest Properties LLC
223
Other Customer
78
Pacific Westline, Inc.
来自SELECT * FROM s1_pm_project WHERE id=的输出：
id
ProjectName
IsActive
CustomerID
RollID
PMID
JobNo
ApproxValue
StartDate
EndDate
ProjectedEndDate
CustomerPO
SalesTaxRate
EstimateID
WarrantyBegin
WarrantyEnd
141
Gorjana - Carlsbad
1
32
1
23
22199
37000.00
2022-02-07
2022-04-29
2022-04-29
22-012-23
0.00
NULL
2022-04-29
2023-04-29
问题最终出在数据库上，特别是 s1_customer 的 id 字段。由于某种原因，它具有 'unsigned' 属性。删除后，一切都按预期工作。
我有几个组合框，所有代码都相似，只有一个 CustomerSelector.SelectedValue 不工作。我什至尝试过这样设置值：CustomerSelector.SelectedValue=32.
该方法用于将所有项目信息加载到窗体中，在窗体加载事件中调用。数据似乎加载正常，我什至已将 'id' 加载到 DisplayMember 以进行验证。
知道是什么阻止了 SelectedValue 的设置吗？
void loadProjectInfo()
{
if (isProjectInfoLoaded == false)
{
try
{
DataTable dt4 = new DataTable();
DBConnector db4 = new DBConnector();
db4.query = "SELECT * FROM s1_pm_project WHERE id=" + JobID;
dt4 = db4.getDataTable();
DataRow PMProject = dt4.Rows[0];
ProjectNameTextbox.Text = PMProject["ProjectName"].ToString();
this.Text = ProjectNameTextbox.Text;
ProjectAddressTextbox.Text = PMProject["Address"].ToString();
ProjectAddressCity.Text = PMProject["City"].ToString();
ProjectAddressState.DataSource = USStates.States();
ProjectAddressState.ValueMember = "Abbreviations";
ProjectAddressState.DisplayMember = "Abbreviations";
ProjectAddressState.SelectedIndex = -1;
if (!Convert.IsDBNull(PMProject["State"]))
ProjectAddressState.SelectedValue = PMProject["State"].ToString();
ProjectAddressPostalCode.Value = (!Convert.IsDBNull(PMProject["ZipCode"])) ? Convert.ToInt32(PMProject["ZipCode"]) : 00000;
DBConnector db5 = new DBConnector();
db5.query = "SELECT id, Name FROM s1_customer ORDER BY Name ASC";
CustomerSelector.DisplayMember = "Name";
CustomerSelector.ValueMember = "id";
CustomerSelector.DataSource = db5.getDataTable();
CustomerSelector.SelectedIndex = -1;
//if (!Convert.IsDBNull(PMProject["CustomerID"]))
// CustomerSelector.SelectedValue = Convert.ToInt32(PMProject["CustomerID"]);
CustomerSelector.SelectedValue=32;
DBConnector db1 = new DBConnector();
db1.query = "SELECT id, description FROM s1_app_status WHERE id < 2";
ProjectInfo_Status.DataSource = db1.getDataTable();
ProjectInfo_Status.DisplayMember = "description";
ProjectInfo_Status.ValueMember = "id";
ProjectInfo_Status.SelectedValue = Convert.ToInt32(PMProject["IsActive"]);
DBConnector db2 = new DBConnector();
db2.query = "SELECT id, description FROM s1_pm_roll";
ProjectInfoRollSelector.DataSource = db2.getDataTable();
ProjectInfoRollSelector.ValueMember = "id";
ProjectInfoRollSelector.DisplayMember = "description";
ProjectInfoRollSelector.SelectedIndex = -1;
if (Convert.ToInt32(PMProject["RollID"]) > 0)
ProjectInfoRollSelector.SelectedValue = Convert.ToInt32(PMProject["RollID"]);
DBConnector db3 = new DBConnector();
db3.query = "SELECT id, fullname FROM s1_user WHERE id>1";
ProjectInfoPMSelector.DataSource = db3.getDataTable();
ProjectInfoPMSelector.ValueMember = "id";
ProjectInfoPMSelector.DisplayMember = "fullname";
ProjectInfoPMSelector.SelectedIndex = -1;
if (Convert.ToInt32(PMProject["PMID"]) > 0)
ProjectInfoPMSelector.SelectedValue = Convert.ToInt32(PMProject["PMID"]);
ProjectInfoJobNoTextbox.Text = PMProject["JobNo"].ToString();
ProjectInfoValueTextbox.Value = Convert.ToDecimal(PMProject["ApproxValue"]);
if (!Convert.IsDBNull(PMProject["StartDate"]))
StartDateSelector.Value = Convert.ToDateTime(PMProject["StartDate"]);
if (!Convert.IsDBNull(PMProject["ProjectedEndDate"]))
ProjectedEndDateSelector.Value = Convert.ToDateTime(PMProject["ProjectedEndDate"]);
if (!Convert.IsDBNull(PMProject["EndDate"]))
EndDateSelector.Value = Convert.ToDateTime(PMProject["EndDate"]);
CustomerPOTextbox.Text = PMProject["CustomerPO"].ToString();
SalesTaxRateTextbox.Value = Convert.ToDecimal(PMProject["SalesTaxRate"]);
if (!Convert.IsDBNull(PMProject["WarrantyBegin"]))
WarrantyBegin.Value = Convert.ToDateTime(PMProject["WarrantyBegin"]);
if (!Convert.IsDBNull(PMProject["WarrantyEnd"]))
WarrantyEnd.Value = Convert.ToDateTime(PMProject["WarrantyEnd"]);
loadContactList();
}
catch (Exception ex)
{
Errors.Exception(ex);
}
isProjectInfoLoaded = true;
}
}
这是 SELECT id, Name FROM s1_customer ORDER BY Name ASC 的输出：
| id | Name |
|---|---|
| 22 | 18-8 Sherman Oaks |
| 206 | Alejo Lugo |
| 233 | Americo Builders, LLC |
| 235 | AMS Solutions, Inc |
| 1 | ARRIS Builders, Inc. |
| 209 | Chris Thrower |
| 105 | CME Refrigeration Controls |
| 53 | Coastline Provisions |
| 117 | Cortech Construction, Inc |
| 6 | Development Support Services, Inc. |
| 146 | East Bay Restaurant Supply Inc |
| 31 | Fitness Mania |
| 7 | Fulcrum Construction |
| 32 | Hardesty & Associates, Inc. |
| 135 | Howards Appliances, Inc. |
| 9 | J Ray Construction |
| 10 | J&L Metal Products |
| 12 | Jahanna L. Nichols Interior Design, Inc |
| 69 | James Barb Construction, Inc |
| 61 | JRE Construction, Inc. |
| 13 | Kamran and Company, Inc. |
| 15 | LA Deli Distributors, Inc. |
| 98 | Lovisa America, LLC |
| 40 | Mobile Customer |
| 120 | N CORONA |
| 180 | N SANTA CLARA |
| 5 | N SERVICE SALE |
| 129 | Orangecrest Properties LLC |
| 223 | Other Customer |
| 78 | Pacific Westline, Inc. |
来自SELECT * FROM s1_pm_project WHERE id=的输出：
| id | ProjectName | IsActive | CustomerID | RollID | PMID | JobNo | ApproxValue | StartDate | EndDate | ProjectedEndDate | CustomerPO | SalesTaxRate | EstimateID | WarrantyBegin | WarrantyEnd |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 141 | Gorjana - Carlsbad | 1 | 32 | 1 | 23 | 22199 | 37000.00 | 2022-02-07 | 2022-04-29 | 2022-04-29 | 22-012-23 | 0.00 | NULL | 2022-04-29 | 2023-04-29 |
问题最终出在数据库上，特别是 s1_customer 的 id 字段。由于某种原因，它具有 'unsigned' 属性。删除后，一切都按预期工作。